eXtremal maybe these is a way to make even less CPU usage for nvidia cuda miner? 6*1070 make 99% load on celeron G1840 and make less CPD than on i5
I know you are asking eXtremal but have you tried setting cpuload = "0" in config.txt?
xpm NEEDS CPU and you are running 6 cards on a slow cpu at that
this isnt like any other coin you cant cheap out on cpu and expect to load a rig full of cards