Initially, I ran Bminer with devfee and the later days with the -nofee option. I never noticed any difference in Sols, and don't know if it ever affected shares/payments.
I confirm you that -nofee option will roughly slow down the miner by 3.5-4%, so you should get 2% less (because no 2% devfee) than normal. If you do not observe any difference, then it is probably a sign that your testing setup is not accurate enough. Maybe you need to run it longer or with more machines.