Re the ztto cassette, I'm running a gen 2 (the one with the biggest cog being alu) 11-34. It works fine. Initially there was a bit of hesitation on the 5-4 "upshift" (going to a harder gear) but it got better over time, and with Wheeltop I was able to dial it all out. It is sensitive to the initial setting of the 11 and b tension.
The comment I would add is that its LOUD. Not horrible, but if you've not used a SRAM one piece cassette before you might think something's up. All of these hollow cnc machined cassettes make significantly more noise than Campy or Shimano.
I didn't weigh my forks as the brake hose was in place and I didn't want to fuss with it, but man those weight differences are disturbing, on the order of 15%. Mine has been ridden enough that I think it would have failed by now if it was underbuilt but I hate being a beta tester.