NoDevFee15.zip from Falcon uses Windivert packet intercepter driver. Claymore miner detects use of this driver, see image from disasembly:
https://ibb.co/qxF4D2s and reduce mining speed, but not showing it, you can read about it in his readme:
Attempts to cheat and remove dev fee will cause a bit slower mining speed (same as "-nofee 1") though miner will show same hashrate.
It means you get slower mining speed AND
but works when use -allpools 1 option but many shares goes to ethermine via ssl to dev wallet..
So better use verified 0.5% devfee version from Rwteam -
https://mega.nz/#F!nrwxDYZK!gxHKJvukNUvEH9xh4V4gGgor 0.5% devfee Phoenixminer from Rwteam -
https://mega.nz/#F!O7p00KzJ!QY1siRR_AnlomCrEoRKxmg