Arizona State Championship - Resteals against tight player

[DesertCat]

I'm down to $17k with the blinds 600-1200 with 50 ante, giving me an M of around 8. I've been playing tight since showing down one weak hand that cost me half my stack, but I'm looking to make a move. The 2004 state champ had been moved to my right a little while before and had generally played tight.

Folded to former champ, who makes it $4k from the CO. He has around 28k and seems a little frustrated. I've got pocket nines on the button, and I instantly push.

The next time around, same blind sizes, I'm the BB, he's the SB, I've got around 22k and he's got around 24k. Folded to him and he makes it 4k. It's his first steal attempt on my blinds. I check my cards and see K9o. I instantly push.

Too aggressive?