Most of the middleground you posted is being done or has been done. Last patch changed the drop scaling so that 150+ are actually rewarded for doing harder content. You already mentioned the 2 dose ambrosia/adrenaline inventory management is coming next week.

Invos are also rebalanced next week which will hopefully incentivise not just elite but all players to actually pick up the hard ones rather than pump up the raid level with as many easy + high raid level ones as possible.

P2 Wardens needed a change to prevent most of the fight time just being nuking the cores, but I agree it probably needs a touch up. Assuming that the invocation rebalancing makes things harder, it might be paired with some changes to speed up P2. Even just giving us an extra tick on the core should allow us to get that final attack off, provided you're quick with your switches and attack the core asap ofc. This wouldn't put us back at the 2 down specdump we had before but should make 3 downs a little more consistent.