Masari has developed CN-Fast and will roll it out as the PoW algo @ block height 204,000. Testing shows a hashrate increase of 30-50% for both CPU & GPU against CNv7.
Sadly after this change we will loose ability to use free Claymore version. I hope that Masari devs will release custom xmr-stack without built in fees.
Or you can compile XMR stak via github and remove the fee yourself. It's not rocket science.