On the consistency problem: My suggestion is, if you run a deck/Vanguard that requires set-up or having specific cards in play, try running Draws. Especially if those cards don't have searchers and your main G3/G4 don't provide draw power. Otherwise, you're just top-decking and you can't go into every match expecting things to go perfectly and smoothly A.K.A. you getting your required cards on time. I've had a game once where 3 copies of my required card ended up on damage; I'm saying that stuff like that can happen. Though, I normally don't interfere with Trigger choices as I say that it's pretty much just up to player preference, I highly suggest you try this, for both consistency and so that you can play the combo sooner.
For the early game, unfortunately GC really happens to be one of those clans that doesn't do much in the early game. Try guarding early game so you have damage left that you can take in the late game. After all, you're not running any LB4 cards. If you run Legion cards like Ruin Disposal, you can even mitigate the triggers you used to guard early.
Card-wise, if that's your G4 situation, that's fine, as long as you have a plan or you know what you want to do. As for G3, Elul doesn't seem to really do much for the Upheaval Pegasus strategy. Perhaps try dropping it and increase Fatewheel to 3-4, or try Ruin Disposal if you have it? G2 ratio is good, but if you're going to insert Ruin Disposal, you'd need space for Steam Knight Puzur-lli so try subtracting from Gear Horse and or maybe 1 from Amber. For the G1s... As useful as Mesh-he is, 1 copy doesn't do well for consistency, at worst you'll draw it when you need other cards, it's either you put it at least 2 copies or drop it off completely. Since your deck's main plan is to Stride Upheaval Pegasus and swing w/ powered-up RGs, your cards need to be contributing towards that goal. A couple suggestions: 1) Increase the number of Summit crest or 2) Run at least 2 copies of Steam Maiden, Ul-nin so that you can draw and gather your Iron Fangs and Mist Geysers faster.