My first and my last MA lipo experience was with two 3s 8k packs, about 2 years ago exact. Not sure what C rating are them, I guess 15 to 20C. Both puffed after 10-15 charge cycles of them, other puffed a bit more. That time I used them in my old style emaxx, one pack at the time. Setup was bk6xl 12020 esc. Temps were quite good, didn't gear it too fast..
The one which puffed more I think was my fault drove the car in -20C temperature. But I had quite good insulation in it.
Funniest part is that I still have those lipos in my aluminium case

charge them from time to time. Dunno what to do with them though..