I've had better luck with higher clocks (sometimes drastic) with dstm.  Course every Rig, PC and Software is different with each configuration slightly.  Just to see if there was a major difference again, I tried the EWBF with the --fee 0 option on one of my 1060's.  I was getting 305-308 sols average.  DSTM same settings 322 sols average.  So with a 6.5 dev fee I'm getting 8-11 more sols during mining.  Not much but quicker but still in the positive column to the tune of a few extra bucks a month (given the markets current drop in price).