hi
@Druid the ultimate can grow big, also grew one in a pyramid partially outside - she took the whole tent when i put her in and was my biggest till then. So you definitely need space if you put one on a pyramid.
Outside and
pre harvest
My friend who got the runtz from me also complains about the moisture in the air, he thinks is because of the pyramids. He put her on a wilma tray and feeds "too often", but not really a problem.
You also got your "mold" mitigated i think now with the salts built up?
After you got used to this behaviour you can go for minimizing your fertilizer use in the next runs with the pyramids, so you save some money.
I got my nutes dialled in so narrow now that i nearly have no salt build up, but the roots cover the surface and prevent moisture and mold.
But now that the end nears i put a dehumifier in the tent.
Good luck and Cheers!