The Stinger and Vulthoo changes makes me think of a Jester T1 Cybran gunship. It's not the most horrific thing, but it can stick around if you don't have interceptors or enough land AAto deal with it. Maybe the Stinger should have more HP and less damage with the speed change? This might give it an advantage in poorly defended areas. THe Vulthoo HP increase is going to play out interestingly.
Different teleports for different factions would be interesting. The beta change seems a bit much. Perhaps have T2-T3 upgrades speed up the teleport? It already costs a terrible lot, so that might be a bad idea. Perhaps upgrade steps for range and speed? Or make Teleport "charges", where you pay for the teleport forward, then instant teleport to your destination. Not all of these at once of course. Just ideas.