Difficult AA Hand: This one had me lost...

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
9 players
Converter

Stack sizes:
UTG: $155.73
UTG+1: $104
MP1: $118.55
Hero: $100.50
MP3: $114.75
CO: $98.50
Button: $65.85
SB: $113.40
BB: $100

Pre-flop: (9 players) Hero is MP2 with A A
UTG folds, UTG+1 calls, MP1 calls, Hero raises to $5, 4 folds, BB calls, UTG+1 calls, MP1 calls.

Flop: K Q 9 ($20.5, 4 players)
BB bets $10, 2 folds, Hero raises to $20, BB calls.

The fact that he bet into me scared me, because i thought he might have KQ or K9 or something like that. So i tried to rep KK or QQ with my minraise to hopefully get a free card(?? is this right, do i want free cards here or want to not give them?), even tho i know it builds pot.

Turn: 2 ($60.5, 2 players)
BB bets $20, Hero calls.

At this point when he led again, i thought it might be a flush draw block bet or still 2pr, so i called given that i have outs against 2pr.

River: 6 ($100.5, 2 players)
BB is all-in $55, Hero folds.
Uncalled bets: $55 returned to BB.

I couldn't think of anything i beat here.

Results:
Final pot: $100.5

Def not sure of best line.

I don't like the flop minraise. Raising to 25-30 gives you much more info about villain's hand. If he calls that bet, there's a good chance he has 99, KQ, etc. Also, if villain is on a strong draw here, like AcJc, minraising his flop bet gives him close to correct odds to call.

As played, I think I take the same line.