This hand came up and one player who I respect stated I should bet a larger sizing 50-66% pot on the flop to target the fun players range and throw balance out the window. The fun player in the hand is calling almost every hand. He came to the table with $3,000 in chips, but has grown to $4,000 by calling with 2nd pair T8d for large sizing MW on Kx8x7d flop to crack T9 and AK with runner runner flush. In this hand he already has his chips racked up getting ready to leave. My only question is what is the correct bet sizing here?

I would range MP with hands like 75s+, Axs+, all broadways, maybe some T9o+... maybe J8s type hands as well.

UTG ($3k) opens $20
MP1 ($500) calls $20
MP2 ($4k) $20
HJ ($500) $20
Hero BB ($2500) AA 3bets to $140
UTG and MP2 calls.

Flop ($460) A53r
Hero cbet $80.
Both fold.

Here I only bet 17% pot, typically I would go around $115 here for 25% pot ($115) being 3 bet of (28bb) going 3 ways. Just figured it's a good range bet for small sizing with most of my JJ+ AQ+ region. Let them float and potentially try and take me off a hand like KK-JJ if they wish. The fish doesn't really float though. He is just a calling station. Don't think UTG is going to make a move with player behind him either. Would imagine UTG to be very pocket pair heavy here, maybe some suited broadways.