If you think so, then probably need some test pool, where only one miner with MOD version are connected. And then need to monitor hashrate, and is there traceable additional wallet activity...
I compared this MOD on two independent systems. On both there was ~ 5.5% extra H/s, interesting.
A few minutes ago i found this mode there too:
https://github.com/c0d3rmod/xmr-stak-c0d3r Only binary on Github... It literally couldn't be more suspicious