Well, I have only built 3 Housewreckers, 8" 12" and 15"  but I can tell you that the 8" was a disappointment to me. (small driver = small sound)

The 12" I built for a "friend"  and he only had some old Kickers to use. Honestly, I was surprised at how good it sounded. Nothing really deep, but fairly clean.

When I put together the 15" I was expecting more deep bass. Still not really made to go much below music notes, mid 30's is going to be about it.
I used 2 different 15"s;  one with an Fs 32Hz and two (iso loaded/ face to face) with Fs of 16Hz. I am pleased with the results for use near my pool outside.

I see your drivers have a low-ish Fs, so give it a shot and report back with YOUR results.

Please do not make the mistake I made - I just wanted to hurry up and finish so I could hear them.  Please take lots of pics and post them!!