£1/1 casino game. most of the players have £200+ eff.

V1=BB (£250) tilting live tournament fish (just busted from the tournament), used to be a regular cash player (a losing player)
before this hand, straddle, V1 EP limp, MP limp, Co £11 open, Hero £36 3bet with KK, V1 limp 4bet-Jam K9s, Co fold, I call but V1 flopped the flush and KK no good.
V2=SB (£250) weakfish
Hero (£300)=regular, solid and aggressive

Preflop. fold to Hero (btn), open £4 with J♦️5♦️, BB SB call.
As I know V1 will not 3bet-resteal with the range like A5s A9s.

Flop=Q♦️T♦️6♥️, xx, hero c-bet £6. SB folds V1 call.
Turn=9♦️, xx (?)
River=3♥️, V1 bet £18 to £24, I raise £57, V1 3bet jam.

Hero?

I will snap fold or take bet turn bet river line vs an ABC/nit player and fold to any river aggression (0 bluffs there). VS a tilting fish I slow played 3rd nuts and got a tough decision.

Questions:
1. Turn decision? (size, frequency, range? which flush combo I should check? The normal line I will take is 1/2 size with a low frequency, occasionally only check back with nuts flush)
2. River calling frequency with Jhigh flush and K high flush in this spot. 10% 25%? or just fold all Jhigh flush as this is the bottom range? (in the game I choose to call 20% with Jd5d, I used the randomizer, call and win the pot, V1=KJ.