Villain is nitty Reg with 20/14/8 stats after 130 hands.
64s is obv a bluff 3bet. He calls and I hit a decent flop to cbet small. I use that sizing quite often i.e. on uncoordinated board textures where I have equity, dont need to be scared of draws and thus give myself a good price for (semi-)bluffing.
After his call he has a lot of Jx, pair and other FD in his range. I guess I have a clear V bet here and plan to barrel any non-heart and non- 8 or 3 river.

Main question is about the river sizing I chose and what you guys think of it?
I guess the overbet is pretty abd because i am only beating Jx and his range contains also alot of higher flushes and some boats.
In retrospect I prefer a small, maybe 1/3 v-bet that I would fold to shove. Sounds reasonable?