I get much higher hash rate (about 10%) across all my GPU mining rigs when mining HVC on zhpool with a higher diff of 0.2+ compared to 1GH.
Is there a possibility to have a higher diff port for the GPU miners on 1GH also?
What is a typical hashrate of one of your rigs where you have the difference? We'd rather adjust vardiff properly than set up multiple ports as this confuses users unnecessarily.