Ray, looking at your exposure suggestions for f10 (where my unreduced Edge Hd sits), it occurs to me that the guide problems I presently have with DSOs at f10 may not be an issue, provided I shoot at normally unguided sub durations (but just do alot of them). Am I correct about that? Seems like a modified DSO Lucky Imaging strategy.
For example, look at the Orange Sky chart, 20mag, Gain 200, f10, I can shoot 35s subs. Given my precise PA, I don't expect any noticable drift at that sub length.
Are there other factors at play in this?
Even though my location is in your Green zone chart, I see no reason that I could not shoot using the Orange zone durations but doing many more subs.