David,

Being that you bought up the flat bottom fuse. The Desire 60 could be a design to look into also. The Desire's wing area is less than the Brushfire and the EU-1.
The extra 100 g of the Speed 13 that some worry about shouldn't be too much of an issue with the Desire. The only problem with the design is that it is a
turnaround pattern design. A pump may be required. Your thoughts, anyone?

Ron