.... no matter how much bleeding I did on a couple of rides my rear brake got the shift paddle stuck on the handlebar, the bike had external routing so bleeding was fine.
Exactly the issue I had, tried bleeding and all tricks to pressurize but still had to pull the lever far too far to get any braking. I thought the need was for a preload adjustment like the Sram force, but the Gex doesn't need this.
In fact, with the GeX, I cut the hose, held it so as to lose minimum fluid, fit them to the shifters and done. No bleeding, they worked perfectly with the out of the box pre-bled hoses. And this is the first time I have fit disc brakes and hoses, I was shocked in a good good way. Also great that Wheeltop include a cheap bleed kit in the box.