I have never personally tried the nomadio radios but i have heard a lot of good feedback about them. Its a shame that they stopped producing their RC products because apparently they have a big military contract to fulfill.
As far as the lipo, you need to have enough amp draw to see a difference when using a 30C lipo. In my stock J82 with a 30C lipo, i notice a very slight punch increase with it compared to a 25C but then again it is stock. It would def help if you were running a modified motor because it will draw more power from the battery as needed. This is a very debatable topic but i would not recommend anything under a 20C as far as racing is concerned. Just my 2 cents.