BB seems to like defending quite wide and has a very high turn bet frequency but hasn't shown too much river aggression

UTG: NO reads

Kind of seems like a mandatory bluff here as I'd expect bets from most two pair+ hand and I'd expect BB to pot control here with his weak Ax. UTG could show up with some Ax but I'm thinking mostly missed flushes and some maybe some weak Ax as his best hands but we can put a lot of pressure on these kinds of hands.

How wide would you attack this spot? I also considered a jam on the river depending on BB size if he did bet. What's your thought on that do you even have a bluff jam in that spot?

No Limit Hold'em Tournament T12.500/T25.000
Buy-in: $25+$25+$5 USD Hold'em No Limit
PokerStars
9 players
Formatted by pokercopilot.com: Poker HUD for Mac and Windows

Stacks:
UTG - UTG (T3.139.184)
UTG+1 - UTG+1 (T1.383.343)
UTG+2 - UTG+2 (T569.946)
MP - MP (T484.692)
MP2 - Hero (T968.580)
CO - CO (T1.756.705)
BTN - BTN (T2.418.286)
SB - SB (T696.249)
BB - BB (T1.739.468)

Preflop: (T66.750, 9 players) Hero is MP2 with 5 5
UTG raises to T53.750, 3 folds, Hero calls T53.750, 1 fold, BTN calls T53.750, 1 fold, BB calls T28.750

Flop: A 7 6 (T256.750, 4 players)
BB checks, UTG checks, Hero checks, BTN checks

Turn: 8 (T256.750, 4 players)
BB bets T98.000, UTG calls T98.000, Hero calls T98.000, 1 fold

River: K (T550.750, 3 players)
BB checks, UTG checks, [b][color=red]Hero bets T450.000

Pre super questionable , only cover one stack behind you so not much scope for bounties and we are calling a utg raise.
Turn would fold , should treat as a gut shot really as a 9 isn’t much good to us, let alone the fact all opponents can have 109 suites combos, bb can have all 109 combos and we would be dead.

River bluff seems ambitious against two players , could work though and get B.B. to fold a weak ace and then utg behind to fold KK or spades or whatever but honestly a lot of the time you’ll just be making your errors on previous streets even more expensive

I like raise ott as a bluff

Turn raise looks reasonable here against a BB leading wide with small size and capped UTG call range.
I would not call turn, it's a raise or fold spot.

River is pretty interesting, it does look like kinda mandatory bluff, and neither opponent should have >1pair often at all. UTG could have KK or A8 but he prob would lead KK otr.
Sizing is tricky here, what do you do with AT/AJ/AQ? The 85% sizing you used here is more polarizing, like 88/T9s+bluffs.

Yeah, I can definitely see the argument for making this a raise or fold spot as you guys suggest. I wasn't too happy about it but my thoughts at the time were that BB was stabbing an awful lot so I figured my outs were good but they could, of course, also be blocking some of them and spades might not be clean outs. My plan though for calling was to also jam if action and runout seemed favorable for that kind of move and of course bluff if they checked.

I'm mostly just betting AQ, AJ when UTG checks. I might stick in a small bet (30-40%) against weaker players on the river but I'd mostly just check back weaker aces as I think getting value here from worse is hard. I'd probably use 70% mostly in this spot with my two pair+ and I think the bigger size here was mostly because I felt BB was gonna station and I had to commit to the story that an ace wasn't good here. However, as you say it does make my hand seem more polarized but this adjustment was based mainly on BB and normally I would just stick to the 70% with my bluffs too.

My thoughts here were to rep something like a weirdly played set or T9. I used the 85% size as I felt BB was the type that liked to station so I figured I needed to put hit 1pair hands to the test.

BB: He did tank for a while and ended up calling 86o, which I would not expect to fold so he'd probably have folded Ax