Try to make the switching more seamless, my fans RPM and  GPU-temps are all over the place when the switches occur.

Perhaps make the switch gradual using two pools/coins, not having everyone switch at once, but rather switch when the fetch the next workitem / submit a share.
That would make the switch happen over perhaps a minute or two, where two coins are mined at once until everyone has switched.

Also, perhaps only switch coin every hour or 30min, as it still takes some time to transfer the funds to cryptsy and sell them?