Leaving a grub for a while will make them spam out alot of unnecessary props. Sometimes you can have 30+ chems laying around. That gave me the idea "why not make them stack". Actually there are three types of grub nuggets.
models/grub_nugget_small.mdl
models/grub_nugget_medium.mdl
models/grub_nugget_large.mdl
Making the nuggets stack and combine in to larger nuggets would reduce the amount of props and make it easier to pick up.
What i had in mind was:
Small - 1 chem (as it is now)
medium - 5 chems
large - 20 chems (4 medium ones)
What could also be added is to give grubs a small chance to produce a medium or large nugget. This of corse if does not ruin the balance to much.