Venom 4600 Batteries @ 170F

I run these 6 cell packs in series to power the E-Revo. After two C/D cycles, I can finally get 11-12 minutes of runtime. However after this last run, I pulled the batteries out and they were 171 and 161. I waited three minutes to get another temp and they both had risen 10 degrees (this was no surprise). Right now they are sitting in from of the window cooling off. This is bad, right? What do I do? Ironically, I actually notice the performance getting better, but the temps concern me.

My motor (Feigao 8XL) was: 115.7F
MM ESC: 73.9F
Stock gearing (38/15)
Duratrax Flashpoint temperature gauge.