What is standard here? PF Question

[CardSharpCook]

You have K [img]/images/graemlins/spade.gif[/img]Q [img]/images/graemlins/diamond.gif[/img] in the BB. 2 players have limped, the SB completes. My standard line is to raise here. Though I am OOP, I figure juice the pot with a pretty good TPTK-type hand.

1)Is there a good reason why I shouldn't be doing this?

2)How many limpers before this is a check?

3)88-TT?

4)For non-paired starting hands, how low do you go? A9s? QJo?

I have PF rules here, but I'm not always comfortable with an aggressive line here. Would like to know how others approach this situation.