My strat for FR....

unopened---raise/raise/raise
limped--raise/raise/raise
raised--Fold/fold/fold (unless they are soooted, then I might call for a look at the flop).

AJ is a good hand to open with, but easily dominated, so I don't like calling raises and playing for a pair on the flop. AJ vs AK--seen it enough times to want to vomit.

I don't play much shorthanded, but if I did, I would probably change my strat for a raised pot to reraise/reraise/reraise. I don't know....