Yeah, try warming the gear up a bit, it might help.

Its kinda a hit or miss for me, especially for quad and calf injections. 3 days ago, I did my left quad and it is still sore, and after 3 days I can finally walk without limping. The day after that injection I did my right quad, and it is not even sore. Massage both areas right after warmed up the gear, and did everything the same. Kinda wierd that sometimes I'm sore like that, and other times I am fine. There has to be a common denominator here, just got to find what it is.