Rob, this is a awesome review comparing the two, the only point I would like to add is that you’re not doing the Armstrong UHA any favors by riding the 140. The UHA are a totally different foil when riding in waves with the new surf 130 tail and a red shim. Try that and then do a new report.
I reckon the difference you felt is moslty due to the difference in span. I would be insterested to hear you opinion comparing Glide3.0 700 vs Armstrong 670 they are identical span. I found that in this High aspect foils the span is a better number to compare them as opposed to surface area.