Its good to see you wanting to return to coding Bitcoin stuff, but make sure this time you don't burn yourself out or let some person comments break you. I don't personally think this is a good idea, because as stated in the shhpool thread, this does in fact subsidizes the block finders (bigger hashrate, aka whales) at the expense of everybody else (plebs) who would learn half or less. Your idea is interesting of letting each user choose the %, but i don't think the main issue goes away.

Now imagine adding V2 and blocktemplate into the mix

Best of luck whatever you choose to do!