Yeah, 13/45 seems to not be as good as I first thought, it'll lift it in first but not effortlessly. With that being said, I have changed the end can (big thanks to knackeredmk1) and I've not adjusted the jetting (similar to your issue), so it is a little flat, then pops off above 50% rippums. I'm waiting on some jets to arrive now.
I have been trying to work out the dimensions of the spacer knackered has in the post xstian linked, but it's being a bit of a pain, total length isn't there, and gaps between the holes also aren't there. Doing this so I can CNC or 3d print a spacer block; they seem to be difficult to source.
Once that's done, I might consider a 50T. Because yes, lifting the front under throttle alone (and a bit of body weight) is far more usable than juggling the clutch too.
The difference between 45T and 47T really doesn't seem like much when using gearing commander, so I may well skip that step entirely. Though, saying that, the JTR301 comes in a max of 48 (and they don't have a 47), which looks like a significant enough bump for me to try that out.
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I wonder if 13/48 might be quite good .. any more than that and it probably wouldn't be great on the road and leisuretrail do dropper blocks although they're £30.
I obviously did have the jetting issue as they'd gone up to a 50 as opposed to going down although I think I found a 2nd issue that was affecting it.
With the jetting sorted I'd ride for approx 20 mins and it's just stall and not start for 5 / 10 mins. The fuel cap had been changed for an aftermarket one and I don't think it was alowing enough air into the tank causing a vacuum, it's not happened since I swapped it back to the original.
If I were you I'd try winding out your air screw before changing the jetting although you may have already tried that.