Thanks for the colour. Have you got a bit more detail on the intensity levels that can be set (and their impact/relation to GPU mem)? Every miner use different intensity parameters...
EDIT: also, I tried your failover script with another miner but then realised you were using parameters only supported by your fork of hsrminer (-r, -R). Too bad, I'd have loved to be able to use your script with DSTM's equihash miner, or any random ccminer out there...

What gpu type are you trying to tweak?
As for script, you can specify any parameter you want instead of -r, just edit the .au3, for dstm it would be like:
$cmdlineArray[0]="--server SERVER --port PORT --user ADDRESS.WORKER --time --noreconnect"
Hmm, ok, thx for that, I'll give it a go. What is the difference between -r and -R by the way (as you got both in your line)?