Thats getting on up there! 4550 in a 4600 pac is not bad. Run them and see if they get better after 10-20 cycles. I bought some premium rechargeables 2700AAs and properly broke them in using a forming charge and I didn't see upper 2600s for over a dozen cycles.

Email Venom and tell them what you've been seeing and see if they have anything to say.