Just got this put together tonight pretty happy with the outcome
Not sure I 100% agree with your logic that a lighter bike is going to suck at descending.Whatever... even if there is a Mach 6 this light it's going to suck at descending. I should know- I built a 21 lb. Mach 429SL and it climbed great but it may as well have been a gravel bike descending. Sort of pointless, especially for a Mach 6.
It's going to suck for descending relative to it's rear-travel class. It takes a hell of a nasty descent for my 6" travel am/enduro bike to be faster at downhill, but when I ride something like that, the 170mm travel yarilanch keeps up and gives me the control to smash into massive root complexes/balls, the 780 bars give me the leverage to keep my front wheel straight, the 8" front brake gives me the ability to go faster in the straight and then check my speed (slow down) faster to keep traction on a turn, the minion/HR2 combo lets me keep traction on the off-camber roots and short-radius turns at speed, the i30 rims give me good support from my tire-size that I chose for speed, durability and traction, the dropper-post lets me get my weight down for control, and so on.Not sure I 100% agree with your logic that a lighter bike is going to suck at descending.
I took a Mach 4 SL out for a night ride a couple weeks ago, and I was 10 seconds off my fastest time down a steeper technical descent. The Mach 4 SL is about 7 LBS lighter than my Switchblade was.