While nist5 is the most profit algo my sgminer doesnt switch to it, still mining x15
f0=0.00 f2=0.00 f3=4.00 f4=3.00 f5=0.00 f6=3.50 f7=12.00
is there something wrong?
I think your 'f6=3.5' should be more like 'f6=2.6'
Keeping it at 3.5 will certainly keep you mining X15 too long.