I think you played the 76h poorly. When you get there on the river , you should lead! What was the sense of ck? You don’t need to induce a bluff because you thought he was as strong a 444 even! He would absolutely call off with two pair. And obviously your hand looks like a draw when you just flat the turn re-raise. The range that you gave him didn’t include the obvious OJ of any suit ; which he would of played like that possibly if he picked up a fd to go with it. I think you made a costly mistake (and even getting it all in on the turn could of been an option) your hand you played pretty face up. Just my opinion
I’m going to watch further to see if I have any questions or comments.

the 76hh hand on the river I think is a pretty big mistake. when you bet/call the turn I think your range no longer contains those marginal turn bets such as 9x and even Tx. ATss type hand could easily be a fold vs the way that population construct x back range in 3 bet pots followed by a huge turn raise on a fairly innocuous card for IP, one that shouldn't really add much EV at all to his range.

so I would put your range to be a little bit of JJ, but even then vs a 17% btn 3 bet I would think that it's best to just 4 bet that pre-flop to exploit his aggro 3 betting. and then just a ton of draws-QJhh,KQhhQJdd etc etc. if we have a set I am just going to safely assume we would 3 bet jam the turn (given the fact he is most likely folding 0% of the time once he raises to this size) and we don't wanna let him x back scary river cards if we flat.

so our range is maybe a tiny bit of JJ/AT and then flush draws with an additional straight draw.

as you said IP probably has 44 or 54ss. or perhaps even KK/AA that wanted to x back the flop because they didn't wanna get raised, and then just pile in money on a brick turn. I don't think it really makes any sense for him to be raising diamond draws ott. AKdd has way too much sdv and doesn't wanna get jammed on. QJdd/KQdd would almost certainly just bet the flop with a bdfd and good equity vs our continuing range. even 76dd would extremely likely bet the flop due to the fact it is 7 high so any time we fold some random hand it is a great win for him, and he also can't call on the turn with it, even when he hits a random pair (unless he binks a straight of course.)

so I feel like he should probably have close to 0 flushes on a diamond.

so I think our best play is to call and then just ALWAYS jam a heart, as we are completely discounting hearts from his range really. and mostly jam a diamond, but maybe base that on our SDV-like always jam our 8/7 high's but probably x fold our K/Q highs.

because if we don't start donk jamming heart/diamond rivers then IP can make this huge raise ott and charge us for our draw and then show down 100% of the time and realise his 75% equity or whatever he has. his life is so much tougher when we donk jam the Kd and he has 54 and probably a 0EV bluff catch.