Man my starting hands have been all over the place

[Fryguy]

I've been playing 6-max for a while now, just broke 10k hand yesterday, and I've noticed a drastic shift in my preflop play and I'm wondering if anyone has undergone something similar.

When I first started playing, I took the general advice, and raised everything. 4-bet pf with KTo etc lol. Had like 35 vpip, 25 pfr. Ended up running really good through this session and was up substantially.

Then my play began to taper off a bit. I realized KTo etc are just as bad in 6-max as they are in fullring, and settled into a 28-30 vpip, but still a high pfr of 20-22.

Recently I've been going through a downswing, and I'm realizing I need to be tightening up more. I'm also finding it acceptable to limp drawing hands like small pp and small suited aces UTG. I'm around 25-26vpip, and 16-17 pfr, which I feel is close to correct, but I'm still not sure about a lot of marginal situations, such as:

AXs utg
JTs utg
KJs on the button facing a raise
KQo facing a raise
AJo facing a raise
Opening from the CO with Ax
88-99 facing 2 limpers in CO

I've been playing 2/4 and 3/6 on pokerstars for a sense of the game I'm playing