Hi Drew,
Sorry to not really answer your question, but have you tried the T1 if you love the X1?
I spent the 3 day weekend rotating between T1, X1, and the new X1 Pro. All different, all nice to ride. However the X1 is definitely a bit slow, the T1 is the best for kite foil when there's enough wind.
Pair it with a kite you can throw around and a small agile board and the whole thing comes alive under you. Lean back on heelside and light it up, and it's got all the speed you need. There was a random fella from Sydney riding an Axis high aspect (ART 699 maybe) with high modulus mast, and he was no faster than the T1.