... although when I do the SCHRS calcs for 1-up, without the jib, it comes out at 1.03, as opposed to 1.035 when 2-up. Given the very close similarity to F16 with the other measurements, I have to wonder if it could be sailed 1-up.

My only concern is with righting it, as it is heavier than the minimum for F16s, at 135Kg.