33s: Too aggressive with mid pairs 4 and 5 handed?

They are almost similar to EricW's hands in the 22s, but these are on the bubble

No reads.
First hand:

Party Poker No-Limit Hold'em Tourney, Big Blind is t150 (4 handed) converter

Hero (t2570)
BB (t983)
UTG (t1880)
Button (t2567)

Preflop: Hero is SB with 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].

UTG raises to T450, button folds - I push

If I would have the opportunity to replay the hand, I think a stop and go could be a better line here?

Second hand:
Villain has been raising two pots in like 6 hands, and he has recently doubled up with tens.

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (5 handed) converter

BB (t2725)
UTG (t1315)
Hero (t1155)
Button (t770)
SB (t2035)

Preflop: Hero is MP with 8[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to t200</font> - I push (I hate calling here, so push/fold is my options). Is the push fine given my read, or should I just muck it?