Thanks. Electricity cost is around $0.04/kWh plus a fixed hosting fee per unit. So I'm best off getting as much hashrate as I can from the units without killing them in <2 years. I've been tweaking my test units the past few hours and feel like I understand the options better. Relieved that I can continue updating as FW improves.

FWIW, I was not at all confused about the dev fee and feel that 1.5% is reasonable if I get at least 5% net improvement. I hope you'll be well paid for your continued FW development. I'm not really expecting much from Bitmain in terms of advancing the FW. One question on the Dev fee, though: I understand that you choose your own pools, but do you alter the unit's other parameters during the Dev fee time? If I have my settings just so, does the dev fee period ramp them up, or just leave them as I've set them.

Thanks.