This is for 2/4 limit

My current pfA is at 6%, but I'd like it to be in the neighborhood of 7%. Currently this is my 'general' pre-flop raising strategy(btw, my vpip is 10.36% if that affects anything):
EP: AA-TT, AK, AQ
MP: +99, KQ, AJ
LP: +A10s in a multiway pot, if I am first person in the pot - KJ, QJ, any PP

What hands should I include? Maybe AJs from ep? What about ATs/KJs from mp? Are these hands I should only add if I am the first in or should I raise them regardless?

Btw, I started with a Sklanskian 'tight table' low-limit pre-flop strategy, but this seemed to get me in trouble since the 2/4 on prima averages 30-35% psf and his strategy is made for 3-5 people to the flop, so these tables are on the tighter end of the spectrum. I found that when I did raise with these marginal hands I just ran into bigger hands or borderline post-flop decisions. I am afraid if I open up anymore that I will be giving up too much. What about you all that play 5/10 or higher? I'm sure you all are used to the 30% psf tables, how do you handle them?
[/u]

Your VP$IP is 10.36% and your PFR is 6%.

You're raising with almost 60% of the hands you play. That's probably some of the most aggressive pre-flop play of any limit player on this board. My VP$IP is about 18-19% and PFR is about 6-7% (for comparison).

The one thing that I have learned about pre-flop stats is that the best combination is whatever works best for you, with admonishments that as your VP$IP goes up, your post-flop play must improve accordingly.

I don't see anything wrong with what you're doing. If anything, I might loosen up a little to take advantage of the lower-limit players that will play TP-no-kicker straight to the river.

Maybe AJs from ep? What about ATs/KJs from mp? Are these hands I should only add if I am the first in or should I raise them regardless?

Yes, yes.

In an unraised pot, raise these. In a raised pot, fold these (unless you're in the big blind and it's only been raised once).

I think you need to increase your VP$IP - 10% is VERY low. If your table is loose, say more than 35% PSF, then you can follow more along the "tight" guidelines in SSHE. If the table is tighter than that, as you mentioned, then you still can play more hands than you currently do. If you want to be extra safe, after two people have limped, you can play pocket pairs 22-77 in LP (raise 88+), all suited aces (raise ATs+), KTs-K9s (raise KJs+), QJs-T9s, KJ-KT (raise KQ), QJ, and JT. That's still a little tighter than SSHE's "tight starting hands" chart and you should profit from these in the long run.