But for some reason now I can't run my rig for more than 5 minutes without it getting a hard crash... I've tried running V10 but that also seems to be crashing now. Not really sure what could or might have changed to be causing it to crash now.
Post the last lines of your log files.
ETH only i have 98mh\s on a rig
ETH + DCR (- decri 5 as lowest) i get 94.7 mhs + 159 h/s
Try "-ethi 16 -dcri 15" and "-ethi 16 -dcri 30". Post here the result.
If your electricity cost exceeds 0.10 USD/kWh, dual mining has a slight profitability edge over single mining on nVidia GPUs at the moment. For me, it's not worth the increased power consumption and hardware wear.