I dont think USA will allow you to increase the FO load very much, because you use so little. I add 7% FO load right now in C-3 without additives. I dont color anymore, so I dont worry about trying to prevent frosting, but when I did color and I did add USA, I only added a tablespoon per lb of wax. I didnt have to wick up when using this small amount and it helped with the frosting when I was selling during the spring.