To remove the 10% dev fee on b8 version just edit the binary using vi editor :
vi xptminer-sse4-b8
:,$s/RUhMA8bvsr48aC3WVj3aGf5p1zytPSz59o/Your_Address/
(ENTER)
:wq
This really vexes me, this is a blatant form of stealing if you modify and run the software without the fee.