Hey as you can read in the readme.txt the param -drci is for in simple words adjusting your gpu to hash the other algo for dual mining. so the lower the better towards ethhash and higher will increase MH/s on sia/dcr/ etc.
But not necessarily fastest at 1. try adjusting or fine tuning it slowly with -/+ key while mining

there is nothing wrong. its just a matter or preference according to profitability.

at this moment i strongly advice dual mining is not profitable due to the asics. I have stopped and putting all my card too eth only mining.