To the OP, don't jump ship yet. I have a suggestion that has worked wonders for me. First I should tell you, I originally had no problem with the bass of the 530s. This was probably because of my limited experience with headphones/IEMs. One day I tried switching my tips and HOLY GOD they sounded like a different pair of IEMS. Everything was just so cleaned up and more transparent... crisper treble, life-like detail, more depth and "connected" soundstage. The overall presentation just became so much better in terms of balance. It made me realize that the culprit (at least for me) isn't treble-rolloff... "it's all in there," it's just being overpowered by the bass. It also explained to me how people can have such different impressions of universal IEMs: sound preferences aside, these things really can vary based upon variables that change from person to person... the only way to eliminate these being customs.
But I'm telling you, the difference I heard is what I'd expect going from a universal to a custom. I've never tried a custom, but this is how good I would expect it to sound.
Here are my suggestions for you:
1. Make sure you are not pushing the tip too far into your ear. Coming from the Etys, you are no doubt used to being earnally probed. The 530s are not meant to go deep. They don't like philosophical conversations. So keep it shallow. They should rest at the entrance of your ear canal.
2. Try using the yellow-foam old-school tips. Make sure they are not too worn out, as getting a good seal is paramount, and these things wear out fast. I was using the black olive foamies before, and they are of course wonderfully durable, easy-to-insert and easy to get a seal with. But there is just something about them that was causing the bass to muck everything up. It was coloring everything, almost as if it needed to be contained but was instead bleeding onto everything else. Well, for me, the yellow foamies made sure the bass only colored "within the lines."
Unfortunately, I can't promise that you'll be able to achieve this for yourself. I have given this recommendation to a few others, and so far have not heard anything back like, "OH MY GOD, THIS IS AMAZING." I hope you'll be my first. I think it has a lot to do with the shape of your ear canal. Hopefully yours is similar to mine