Problem with KQ

[JohnFR]

I seem to have a problem with KQ, I slightly overplay it when behind, and underplay it when ahead. I am contemplating not playing KQo or KQs, except when on the button, SB or BB, almost treating it like I do 56s or some hand similar to that. How much EV am I costing myself by folding this hand everytime while I am not in a button/blind battle? If I do stop playing it completely I will still use it as a pushing hand when I can open a pot with 8 or less BB's as it does fairly well hot and cold when you can be the aggressor.

Thoughts?

Cheers!
John