So, we currently have promotion of Common, Fine and Rare, along with promotion and demotion of Mist Essence.
My suggestion is a two parter:
1) How about a demotion recipe for all respective materials
2) Make mystic forge recipes less RNG with a smaller output gap. What I mean by this is currently you can get anywhere between 40-190 for a t2-5 Common promotion. This gap seems much too big.
I believe some form of these suggestions will help stabilize the mats market a little.
Any feedback and discussion is welcomed!