Why not just have an unlimited share amount, but the receiver can only be capped out to lets say 80k.
Or just make the cap x amount above whatever that player would normally start with for their rank. Still, an organized team can still abuse this just as easily. The starting team might not have a heavy but they would have multiple players with mediums or some such. That could be just as bad.
The new rank structure is a bit wakky IMO. I've always felt the 49k to start was sorta bizarre since were you to go lower, there are plenty of sub 40k variants available...just a strange and seemingly arbitrary c-bill allocation. Now, we also have 2 new "half ranks" where you get less of a c-bill increase than you receive at all the other ranks. The whole thing is a counter-intuitive mess my OCD nature rebels against.
How about we just start as a 40k c-bill cadet and have 120k at max with a 10k increase at every rank? This will still limit the bigger mechs from pre-.4, and we'll have a list that's a bit more workable and logical.