I'm running a Vivid Air, which I think may have something to do with it. I have considered a coil, but honestly I don't love the Glory in general. Tubing feels/sounds paper thin, and I have doubts about longevity. I don't love the bike, so rather than putting more money into it, I want to get something that I actually want.I'd get the Gambler.
What shock are you running in the Glory? It should be better than some of those other bikes in the rough. I'd be inclined to think there's a setup issue. But either way, the Gambler tops your list if the geometry and sizing agrees with you. Slays the rough, jumps pretty well, and has one of the stiffest rearends (axially and torsionally) that I've felt on a DH bike.
The thing that sucks about the Glory is that the suspension curve is actually designed for an air shock - it's digressive at the end of the travel to compensate for high ramp up of an air shock, so that limits the options I would have as far as coils go.
I know how to set up my suspension and I have it set up in a sweet spot right now. As I said, it's not glaringly bad at anything, but just not great, especially relative to that Trek. I haven't ridden any of these other bikes, so I'm fishing for commentary on which bikes might be better in what ways vs. my Glory