3 + rebuy, did I overplay AKo?

[Emon96]

Read on the raiser was a semi-donk who had raised the same amount and then folded threee times in the last two orbits. Is a flat call more +EV or is my push to isolate/get FE a good one.

PokerStars No-Limit Hold'em Tourney, Big Blind is t600 (9 handed) internettexasholdem.com

Button (t15856)
SB (t13965)
BB (t30572)
UTG (t17905)
UTG+1 (t9586)
MP1 (t14660)
MP2 (t23330)
MP3 (t36899)
Hero (t19460)

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises to t1800</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t19410</font>, <font color="#666666">2 folds</font>, BB calls t18810, UTG+1 folds.

[Double Straddle]

I like a flat call here. Are you ahead of his range? Probably. However, if you flat call you will get more value from his Ax and Kx hands when both of you flop just one pair.