I am having similar difficulties. Used 1625 straps as well but not much different from what you got at 1750. I think we are going to need some custom straps, but I can not get the cgi wrapper to work from @eliovp - even using the direct IP address he gave us.
I did the mods that the strapmod tool does manually... i gained about 0.35 MH/s per card. I would gladly pay a little to get these up/close to 30 but I only have 7 of them right now.