Welcome to the forum Aksel. Did you receive it?  Still waiting?

I suggest getting a few hundred hours on the amp and tubes to get a base line of the sound. Cryotone offers a few different tube types and they have different strengths.

EL34 are what Don suggested to me saying they are his favorite in the Decware PP amps.

Improve the sound is a tricky one. How do you want the amp to sound different? What do you want your stereo to do better than anything else? Holographic? Bass slam? Subtle nuance and finesse? Focus on crisp shimmery highs? Warm and syrupy?

This isn't an either or situation. It's what is your top priority and second priority? The more detail about how you want your system to sound and how it sounds now will make the advice much higher quality.

I think what you'll find with the Cryotone tubes for the Torii are a more dense, focused sound--not necessarily overly warm, and with sufficient detail.

I used Tioriis for years, though I do not have one currently.

I started off with 6SN7 tubes from Cryotone and strongly disliked them. It put me off from exploring Cryotone tubes further, but they simply were the wrong choice for my then system. Later I tried more Cryotone tubes and found that though they differed from my favorite NOS tubes (many of which were not as expensive) they did have a bit more density to the sound and a focus that was not etched or harsh and I was able to build a good complement using them. Now in my ZROCK2 I use a Cryotone tube, and in my SEWE300B I use Cryotone tubes for the output, driver and input tubes (favoring a Sophia Electric for the rectifiers and not wanting to move away from my favorite VR tubes, the 75C1--Steve seems to like them a lot too.)

I was a reluctant convert to the Cryotone tubes and feel that they are worth exploring in time, perhaps starting with the input tubes.