...playing pretty poor poker?

I think I might be overplaying my PPs in a lot of situations.

So here's my hypothetical. Youre on the button. UTG, an unimpressive ABC player raises his standard 3-4x and...

A) Theres a cold caller. You hold 77. Raise or call?
B) No cold caller, folded to you w/ 77 OTB. Raise or call?
C) Repeat A and B when you hold 88-TT
D) Repeat A and B when uou hold 22-66

What I'm trying to get at is what factors influence youre decision to coldcall or raise with mid pocketpairs. In multiway pots it would seem I'm often gotta-hit-to-win, but if its 3 way and I hold 77 I'm often holding 50% equity in a 3 way pot. That would lead me to raise. In a headsup pot, though, where I'm more likely to be 50/50, I tend to raise more in position hoping that if I miss I can use my position to either cbet and take it down or take free cards depending on the board.

I'm pretty 'meh' here. Help?