Obsidian Mettle and Unburdened Flight need to be baseline, but IMO what Hover needs is to be off the GCD and castable while casting rather than what you suggest. Moving the entire kit into being usable while moving destroys the playstyle the spec is supposed to have.
The spec is supposed to be short-range and require planting its feet now and again for its highest highs, and in exchange is supposed to have the kit that supports that. What you’re suggesting would just turn it into the ranged version of a chimp melee spec. You also say that the spec has no moment-to-moment skill expression, but then turn around and request that what is supposed to be the bulk of that be removed. Not saying it couldn’t use more, but positioning and Hover management is very obviously designed to be the cornerstone of its skill expression.
The issue with the spec right now is that it doesn’t have the tools to function as fluidly as it should within its range and playstyle, but destroying that playstyle is not the correct course of action. Instead it just needs to be given the tools it lacks. As you say it could use more mid-CD utility, and one thing that would fit well with and enable the spec would be some sort of lesser immobilization. Maybe you can’t expect to set up a big Fire Breath just through positioning your own character, but between your own positioning and using this CD you could set up lesser bursts.
Hypothetically let’s call it Swirling Sands, and it’s a Bronze spell that opens up an AoE of temporal sand at a target location, preventing displacement (knockbacks against allies and dashes from enemies) while slowing enemies by a large amount and hasting allies by the same. So now you have this interesting utility that extends what being out of position means against you even without Landslide up, and which enables you to set up the hardcast part of your combo before following up with timely Hover uses.
The bottom line though is that the unique playstyle of the spec should be emphasized rather than gutted. It’s supposed to be a mid-range caster, not a long-range melee spec. Give it more CC, or more mobility, or more utility. Whatever the spec needs to work in that way is what should happen, up-to-and-including heretofore unthought of things like making its empowered spells natively provide full immunity to any CC or disruption. The only unacceptable answer is what is currently being nerfed, which is toxic, assassiny one-shot shenanigans. Anything else that maintains and enables the playstyle is fine.