Current stakes: 25NL, No HUD on Ignition. I am getting more comfortable with my opening ranges (Thanks for the advice on my Opening Ranges Post. I noticed an immediate improvement in my game.)
Now I am trying to understand calling/3 betting. I read about the Gap Concept, so in position I call with hands I would've opened with from the preflop raiser's position or if I've seen the PFR open really wide (I've seen player's opening 4x in EP with J7s), I widen my calling range considerably if I think I can isolate. I 3 bet with AA, KK, QQ, AK, sometimes AQs. Out of position I only 3 bet,dropping AQs. My 3 bet is 3x the PFR's amount.

Aside from the BB start out by not calling any hands and work from there. Want to play the hand then 3bet. What you're doing now makes you hit the call button a considerable amount of the time and in reality there are very few hands you should be calling with anyways so you might as well not do it at all.

+1 to what Kelvis said. Don't do much calling in position. It caps your range and it invites other people to squeeze or overcall, both of which are bad for you.
While you can often call in position with some mid-strength hands that have decent equity vs the opener (stuff like TT-88, AQ, AJs) and that can sometimes defend vs a squeeze, you should be 3-betting more often than calling. If you're 3-betting JJ+ and AK at the top of your range, you should balance those premium hands with stuff like KQs, ATs, A5s, A4s, 76s, 65s that don't do particularly well as calls, but that have blockers and equity vs villain's flatting range (but also have easy folds vs a 4-bet by an EP player).
At 25NL+ especially, it's not going to be very profitable to go set-mining with 66-22, or to try and see flops with suited connectors like 98s. I typically just fold the hands that don't flop very strong hands or nut draws. You should also be folding (or occasionally 3-betting) with dominated hands like AJo or KQo, as those play very badly as calls.

I mean what I said is going to sound nutty but you can construct ranges that require 0% flatting on any position except the BB. If you know how to construct 3bet ranges it might be better to fold everything else.