I ride an HPC 160 in 22″, took 3 weeks to arrive as they had all sold out in the UK, but without doubt well worth the wait.
Had it a month and have yet to fault it, I am 6’4 and the sizing feels good. It isn’t a long top tube but I don’t notice this to be a problem, I suppose on some long grindy climbs it could do with being 1/2 inch longer but I don’t really use the Talas which would tilt me forward a bit and remove that issue. I also have the seatpost a bit lower that I should (no dropper yet), which would help.
Overall the bike is amazing, have totally taken to 650b and wouldn’t hesitate at 29er, it doesn’t feel like a 160mm bike with the relatively lightweight. Only change will be a dropper and possibly wider bars but I am not sure on that, 750mm is fine really.
I also went tubeless, just added rim tape and sealant.
The 140mm will be great as well I am sure but am glad I went for the 160mm.