No real reads more then that SB felt really solid and no real reads on the others.

Poker Stars, $200 Buy-in (600/1,200 blinds, 120 ante) No Limit Hold'em Tournament, 9 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite. View Hand #33816481

UTG+1: 33,552 (28 bb)
UTG+2: 13,304 (11.1 bb)
MP1: 31,846 (26.5 bb)
MP2: 28,950 (24.1 bb)
MP3: 78,484 (65.4 bb)
CO: 6,820 (5.7 bb)
BTN: 35,344 (29.5 bb)
SB: 55,114 (45.9 bb)
Hero (BB): 35,156 (29.3 bb)

Preflop: Hero is BB with 7h6h
3 folds, MP2 raises to 2,400, 2 folds, BTN calls 2,400, SB calls 1,800, Hero calls 1,200

Flop: (10,680) 4h9hJh (4 players)
SB checks, Hero checks, MP2 bets 6,340, BTN folds, SB calls 6,340, HERO ?????????

I had a hard time making up the correct play here between a call, shove or fold. The good thing with calling is it reduces variance against Ax hands with A of hearts. If a heart comes on the turn we are done with the hand. The problem with calling is that SB will likely check turn and so will MP if he doesn't have a flush so we will have to donk to get money in on the turn or otherwise we will give a free card, which will turn our hand face up. If we had position I think a call is as good as shoving.

I tanked for some time, can't remember if it was all that long but I just had a feeling that SB was trapping with a big flush. I went over his range and came to the conclusion that he never has AA KK QQ or JJ in this spot. Possible sets are 99 and 44 but I would expect a raise from a set here when button has already folded out. I would expect hands like AhKx and AhQx with A of hearts to 3bet pre and AhJx to raise flop. The only 2 pair combo is J9, dunno what I would exepct from him with that but a call is not unlikely. That leaves it with a few combinations of AhXx and made flushes.

I was leaning very heavily to him having a flush here. Posted the hand on another forum and got the answer standard shove.

What do you think? Am I overleveling myself in this handreading spot and should just close my eyes and shove or what? Any thoughts is welcome. Did I miss out on possible holdings on SB?

I'm not worried about MP because his range remains the same and if he has flopped a flush so be it, it's SB that I'm worried about in this spot.