The only changes they've made were nerfing the first two or three tiers. It's unfortunately just the ludicrous amounts of RNG and the ridiculously overtuned enemies and modifiers that make the raid such a trainwreck. And I can definitely understand your concerns over its becoming more and more frustrating. These last few runs, the DDKs and even the regular B1s have been dodging way too often, for example. Protection disruption is still being applied to Gungans. The whole TM reset at the start of each wave, especially when you're running a Maul team. I could go on and on. The theme and the visuals are great, it's the execution that leaves a lot to be desired. I can hardly wait to see what the next raid will be like.
