Should I switch enclosure size?

Hello,

I have 3 ball pythons and 3 tall V-70 rack from c-serpents.
Currently, one is over 1000g and is in the tub by herself.
However, the other two ball pythons I have, one is 350g and other one is 250 g. I got a dividers so that I can put two of them in separate space within one V-70 tub.
However, the length of the tub is long enough for 350 g to stretch, but when he is rolled in, width seems little tight for him. I was thinking if I should give him his own tub. I know 350 g is preferred to be kept in 15 qt or so, but can't really have separate tub since I only have one thermostat.
So my question isn't really asking if I should put him into whole tub or not, but rather asking experience from people who had success keeping smaller balls into V-70 (41 qt) tub. I will be providing 4 identical hides, 2 on each side with big water bowl.

Thank you!