You already know my thoughts, but I'll post here anyway for criticism from the masses.

I would rather bet $1.75 on the flop to keep Qx around. LP raising to 21 sounds like a bet he would rather not get called, so a push is exactly what I do. I expect to see 89 often due to limping in LP with other limpers. AQ probably would have raised PF but you never know with some of these donks. JT or A[img]/images/graemlins/heart.gif[/img]x[img]/images/graemlins/heart.gif[/img] probably would have flat called the flop PSB if anything.

EDIT: in other words your line is basically fine.