Since you've revived this thread Lansdowne . . .
I don't have a lot of experience in difficult backing situations, but my slip is oriented such that we usually have a crosswind (often 10kts or so). Where some of my neighbors struggle backing out when the wind is up (one of them even needing to let the wind blow them off the wrong way, then doing a 180), my PSC '34 with MaxProp does quite well. Based on the previous posts here, I suspect that my MaxProp (with its blades that reverse their orientation when backing) may be helping significantly. I know its not my great skills since much more experienced sailors struggle a lot more than I am in the cross wind. I normally give it a blast to get the boat moving (sometimes initially fending off with a boat pole though), then shift into neutral and coast out.