Betterhash UI works ok but needs some work; as for the Betterhash-Preload remove it it or fix  BH is not on startup via settings but it does load on windows startup until you remove preload entry.

The Betterhash core CPU miner powercore-main.exe seems to be nothing more than their own built distribution of xmr_stak_cpu miner there are many out there. This version rewrites the config file for miners on start; which is pcore.ini. To circumvent this  just find and use a different version of xmr_stak_cpu or build your own from source just make sure it does not use the pcore.ini file as a config because Betterhash.exe replaces it when you press start. Then rename original powercore-main.exe to something else and place xmr-stak-cpu.exe in same directory and rename to powercore-main.exe. When you use this method you will have to manually configure the new cpu miner via config.txt usually.