I would jump on that it'd be nice to rebalance this a little bit at legendary quality. The potential for legendary T4 prod modules is one of the things that can carry on into the very late game from Cerys. But, the difficulty in producing legendary plutonium makes it pretty impractical, even if you were to only use it for exclusively your biolabs. 4 modules per lab at 20 minutes each is an awful lot of legendary plutonium. The best plan I could think of was to upcycle uranium via ammunition and then let the legendary uranium be transmuted in the normal way. Maybe I'm missing something obvious, but mass upcycling 238 via ammo is still quite miserable. I was thinking of trying the artillery shells perhaps, shipping the components from vulcanus.
Perhaps instead of 1-to-1, make some number of recharge packs per plutonium, even if the other components were expensive and required a working space casino or quality chain elsewhere? Or some other recipe that could offer an upcycling path? Perhaps an alternate method for recovering spent fuel that skips the liquid step (so you could maintain the quality through the fuel cycle)?