Let's just talk about IP 3bets for now.

a) do I want the person I'm 3betting to have a 0EV 4bet with all his potential 4bet bluffs? This seems right but perhaps not ideal in practice. He has already invested 2.5bbs and we are splitting the blinds so he could have as much as a 4bb profit with a 4bet bluff before his bluff was making my 3bet breakeven. I feel like giving him +1bb 4bets is probably fine since it lets me 3bet more, I'm still making 3bbs on my 3bet even when he 4bet bluffs, and it's really easy for me to make a tiny adjustment and suddenly be absolutely crushing him if he's consistently taking the 1bb 4bet bluff that I give him an option to make.

b) what % of my range should be

1) 5bet value jams. 2) 5bet balance jams (A5s for example). 3) 4bet calls (do I 3bet a combo of JTs and QJs so I can have a 4bet calling range, for example?). 4) 3bet bluffs with blockers (AJo). 5) 3bets with postflop playability but which will fold to a 4bet (97s).

c) How wide do I 3bet? Do I just look at all my value hands which do better 3betting than calling and then add the other parts of the range to balance those hands?

This is a thing I will be working on for the next couple of days.