For anyone still struggling with the Captain Marvel ramp, if you are using any sort of silicone or non-stock rubber, try going back to stock for awhile and see what happens. I like Perfect Plays on many games...to me they are the closest to real rubber I have tried, and they look nice. But I have been noticing on some games, the shots just do not feel right. It seems like Elwin games especially suffer, which kind of makes sense as he pushes the boundaries of shot geometry more than most. My Iron Maiden especially shot like crap with anything other than stock rubber. I switched my AIQ back to rubber a few weeks back, and thought that shot quite a bit better too. Shots feel more like they are where they should be, ramps and orbits had more speed and snap, and most importantly, the Cap Marvel ramp was MUCH easier.
I have been playing with my pitch a bit, trying to find the sweet spot for all the shots. I am sure it is mostly me, but I had really been struggling with some of them, especially Hulk and Black Panther. I tried ~6.5 and ~7.0, neither of which felt quite right, and landed somewhere between the two where everything finally seemed to flow together better for me. Then just for fun I thought I would switch the rubbers back to the Perfect Plays and see if that was all in my head. Nope. While most of the shots were still ok, the Captain Marvel ramp just went to hell. Good shots were back to a 50/50 if they were going to make it or not. It just seemed to run out of gas more so than an actual reject. Went back to normal rubber, and boom, combo after combo with no issues (other than my own accuracy). I THINK what is happening is the Perfect Plays (and any other silicone), being a bit stickier, is introducing some extra spin on the ball when flipped. That spin seems to be fighting the geometry of the Captain Marvel ramp. Besides that, the rubber must be slightly harder (?), which is what seems to give the rest of the shots a bit more "authority" when hitting them.
So long story short, if you have fancy flipper rubbers and are struggling with the shots, especially the Capt Marvel ramp, give regular rubber a try. You might need a few games to readjust your accuracy, but it's worth a try. Sure they do not look as good, and will wear quicker, but for me the playability difference was huge and that is more important.