STTs: I'm missing pushes, and second guessing every move.

[kevstreet]

I just started playing on Poker Stars. According to Sharkscope my ROI is 5% after approx 550 STTs (I know - not much of a sample size). And this doesn't bother me in the least. However, recently I'm questioning my play because I think I'm making some mistakes and taking wayyy too many thirds.

1.) Does everyone shove this hand?

$27 STT - Blinds 200/400 antes 25

BB 897
SB 4957
Hero 3615
UTG 4031

UTG folds, Hero T [img]/images/graemlins/spade.gif[/img] 8 [img]/images/graemlins/diamond.gif[/img]

As for reads, SB hasn't done anything out of the ordinary and it would make sense for BB to have a huge range here, right?

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2.) What's your line?

$27 STT - Blinds 75/150

HERO 1900
SB 2400
BUTTON 3500
CO 2000
UTG 4200

Hero is dealt A [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/heart.gif[/img]
UTG raises to 450, fold, fold, Button calls, HERO?

Nothing fancy from anyone thus far...

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3.) An observation: On a $16 table I played against a player that 10-12 tables with a Sharkscope ROI of 15% after a bajillion tournies. He raised from UTG+2 (full table), second level w/ ATo? In fact, BB was very short and was basically forced to call. Am I too tight? Unless I'm CO or the button or it's late game I'm not thinking of playing this hand from so early.