Unibet 10nl (0.05, 0.10)
Hero: 12.22
V1: 8.97
V2: 12.83
V3: 11.43
Hero: 7♣: 7♥:
Preflop:
V1 raise 0.25
V2 call
V3 call (Button)
Hero call (in big blind)
Flop: 6♣: 7♥: 2♦: Pot 1.05
Hero check
Check
V1 bet 1
Hero call
V2 Fold
V3 Call
Turn: 9♦: Pot: 4.05
Hero check
V1 bet 2
V3 fold
Hero call
River: K♥: Pot: 8.05
Hero check (8.24 left behind)
Villain 1 bet 4.2
Hero shove all in (4.04 more than Villains bet)
Final Board: 6♣: 7♥: 9♦: 2♦: K♥:
Villain 1 shows: :8x::5x:
V1 opened UTG so I thought it unlikely he had a straight, I thought it was more likely that he has blockers and is bluffing or had a weaker made hand. I didnt reraise on the flop as it was really dry and I thought villains would fold without having a set or two pair (sometimes).
The villain bluffed aggressively previously so I though he carry on bluffing as he did in previous hands (no stats as I play on unibet). On the river after he bet I thought a straight was unlikely as :8x::5x: or :Tx::8x: would not open preflop UTG (or so I thought) so I shoved with what I had left behind (4.04), I thought lower sets and some to pair hands could call. As only four hands beat me, 
:9x: :Kx::Kx: or the other two hands mentioned above, I thought I had the best hand the majority of the time. I think kings would re-raise pre so I discounted those (nines might re-raise on the button but again 99 has 3 combos)
Is this value shove too thin?
Should I have re-raised pre? I think even though their ranges are capped, this mid-strength pocket pair had great implied odds in a big multiway pot.
In general what should I be thinking about when value shoving three of a kind on a board that has a straight, or a flush on a paired board ect. ?
When shoving in these spots (i.e, 3/4 best hand), I am often unsure whether it is +ev or -ev.
All help is appreciated 
for a backdoored flush).