I have a P5... and the manual says the "high current" outlets(zone D on the P5) are identical in function as the other outlets... including regeneration and "in addition" have an in-rush limiter which brings the full AC up slowly.

Observing the power draw meter on my P5 reveals that a Decware Torii is a "Class A" amplifier, in that it draws the same power at idle or at full volume.  I also had a large class A/B arc welder of an amp(Aragon 8008BB) which I had attached to my P5 at one time.  It only drew 25 watts at idle per the P5's meter, but as the volume knob went up, so did the draw on the P5's meter to over 400 watts at a comfortably loud listening level.  As soon as the volume went down, so did the meter on the P5.

My Torii Mk.3 shows that it draws about 150 watts whether it is just on, with no music playing, or with the volume at party levels.  Its power draw does not vary with volume - as is the case with any Class A amplifier.

So there is no need to worry about dynamic "current limiting" with the PS regenerators unless you are running class A/B 1,000 watt solid state monoblocs or something.  This is a situation that does not exist for a Class A amp of the power ratings we're talking about here.  Other than within its own circuitry, but a PS regenerator can't do anything about that.

If your PS regenerator does not trip its internal relay briefly or instantly turn on its fan when you hit the "on" switch on your Class A amp - then you're good to go - it will have no problem supplying power to your amp at any volume level or under any music dynamic conditions.  A Class A amp circuit, is by definition, making full power all the time - it either delivers that power to the load, or it is expended as heat.
 
I have an entire rack of equipment plugged into one P5.  Most all other components have constant power draw so increasing power draw as the volume goes up or under dynamic conditions is not an issue there either.

You would be stunned and amazed to know that I currently have one pre/pro, three preamplifiers, a CD player, two DACS, a Burson Buffer, a Sirius receiver, a Torii and a ClassDaudio amp all plugged into one P5 that is plugged into one dedicated 20 amp line.  "Yes"... I know the P5 doesn't have that many outlets.  I have several of the less critical components plugged into an Emotiva powerstrip that is then plugged into one outlet on the P5.
Obviously I'm not actually using all of these components at the same time(I'm doing some evaluations), but they are all plugged in and at least in their "standby" modes all the time.  Ironically or not, my older Theta Digital CD player draws 55 watts in standby and also when its "on"(its claimed to have Class A analog outputs - guess it does).  All the other components together only draw 44 additional watts.  Checking my P5 just now,  with my Torii turned off, it shows a draw of 99 watts steady as a rock.  I actually had the pre/pro on with Sirius running thru it, just no amp on.  When I switch on my Torii, the meter jumps up and bounces around too fast to read for just a second or two and then settles at 252 watts, and it stays right there whether any music is playing or if I turn up the volume until my ears scream uncle - power draw remains the same, doesn't budge a single watt.

Now I suppose... that the P5's meter does not register fast enough to reflect every little change.  But neither does the power supply in your amp - that's what the power supply capacitors do - smooth the power ebb and flow.  But given the fact that I have observed the behavior of my P5 with a few class A/B solid state amps.  And then subsequently watched how it behaved with a couple of class A tube amps, I think its safe to say "dynamic" power demands of lower power Class A tube amps, such as Decware's, is a non-issue.  And certainly 252 watts steady draw is well below the P5's capacity and well below the load that one 20 amp circuit can supply.  Having everything on one circuit also makes for one extremely quiet system, no chance of ground loops.  I have 98db efficiency speakers, and with my ear only an inch away I can barely detect any hiss or residual noise at any setting of the volume control.  I also have a pair of vintage Klipsh at 101db efficiency - still no noise.  I'm sure the P5 has something to do with this also, as inserting it into the system produces more "rez" across the frequency range, blacker backgrounds, hearing farther into the recording and ambiance in the recordings that I never noticed before along with increased dynamics, especially micro, but even macro dynamics are notably improved.  I consider the P5 an "essential" part of my system.  I had a PS Powerplant premier before this P5 and I was sold then.

LR... check the power draw of your ZMA on your P10 - I'm curious.  Typically Class A amps are only about 25% efficient.  If my P5's meter is any indication, either my Torii is less than average in efficiency, or putting out more power than its 26 watt rating Steve puts on it.