Let me sum it up.
You tested for a day ? Wow, that a lot of testing. Why not 5 minutes, you would have saved time and gotten about the same results.
The PhoenixMiner is faster. I know. I've proved it many many times comparing to Claytmore. I've tested for over a month running both miners. I know, you don't.
I don't know anything about who's Kernels belong to who and I seriously doubt you do either.
But I do, I've dumped both kernels and they are virtually the same. Like almost the same. Almost - some labels named differently for example, but when you disassemble, labels always look funky.
Also I did test Phoenix vs Claymore for more than a day ; ) Two days actually ; ) But on 10x 6xGPU rigs. Same hashrate.
But fee on Phoenix is lower.. so it's actually no brainer which miner to use ; )
Except I can't use Phoenix, cause temp stop option is not present.