Select your own GPU cluster (down only)

I want to be able to pick my GPU cluster in Tygron. For specific calculations with water models the biggest cluster can take significantly longer then the less extreme cluster. I have two identical overlays. One is running on the heaviest cluster and will take over 2 hours, one is on the cluster one step down and is done in 6 minutes. I can work around this by making a copy of my project, add multiple layers, refresh that copy so all GPU clusters are taken and then refresh my main project which is forced to go to lesser cluster and can calculate fast.