UTG+1 seems quite tagish but no real good reads on him
BU playd over 50 hands 80/14 style with a high postflop aggression

Grabbed by Holdem Manager
PL Omaha $1(BB) Replayer
Hero ($130)
BB ($66.35)
UTG ($101)
UTG+1 ($100)
CO ($100)
BTN ($455)

Dealt to Hero 7 8 7 T

fold, UTG+1 raises to $3, fold, BTN calls $3, Hero calls $2.50, BB calls $2

Here, I thought the hand should play really good multiway so I call it.

FLOP ($12) 6 9 4

Hero checks, BB checks, UTG+1 checks, BTN bets $11.40, Hero calls $11.40, BB folds, UTG+1 folds

Here, I'm not sure about my line at all. multiway it is less likely that the openraiser will cbet this kind of a flop. So should I be more inclined to donk/call this flop or even go with the hand and donk/push flop?
I thought donk/call is better than donk/push because if I get it in right here I run against sets and (2)pair+draw (which could dominate me)

But I'm not sure if donking at all is better than check/call.
check/raising looks also not that good because I'm always behind but commited to get it in after I check/raise.

All in all, I'm not happy with my flopline and think donk/calling good be a better option.

TURN ($34.80) 6 9 4 J

Hero???

Now, it is HU. I have two 7s, so I could start to rep 57 or just check/call again and hope to improve. Because Villain is so aggressive its very likely that he will bet again with nearly 100% of his range but OOP sucks.
c/c turn and only donking improved rivercards looks sooo obv.
If turn would be J I think c/raising would be the best line. Any reason to not c/r with flushdraw in the hand against an aggro opponent who is likely to bet is whole range again?

I would fold this hand preflop pretty much as im oop (gapped, pair in the hand, badfd, lowpair). If i somehow managed to get on the flop, I would try to donk and steal the pot away right on the flop and call a reraise. On the turn ppl check back way too much so I would definitely donk too to get some value out of flushdraws, sets and stuff. I think you are wrong that aggro opponents will most likely bet their whole range again when the most obvious draw hits. Most ppl go for cf mode and check back hand which have value, so you should try to get some value out of those.

ya its prob a fold pre...flop I prob just c/r this 130 deep...good equity vs anything, hard to play later streets OOP etc etc...

i just muck this pre.i think i would just c/r the flop.if he is as agressive as you mentioned we should have some fold equity and have decnet equity vs his range

yea, i'd prefer betting the flop as well, against a raise i'm probably folding, our hand is a bit weakish with the sevens blocking some of our outs. if the hand was TT87, thus having a little more equity against twopair/toppair+draw type hands, i'd be check/shoving or bet/stackingoff much more happily.
c/raising is an option here too, should shut out the rest of the field and the hand is basically over - i'd prolly just shove any turn.

turn, what do you mean by repping 75? :O
i think i'd just check/fold there against any reasonable bet, a flushdraw got added and only the non- 5s and 7s remain as nut outs.

Yah you've heard this before, but if you are gonna overcall a raise preflop and you get this flop and don't try to get all your money in, just fold pre. When you hit the unlikely seven on the turn, you have the nuts and a set. If doesn't get too much better than that. As it is you have all nut outs on the flop.

white_mike says it well- just get it in if you can.