Jumping to something like that from Momentums is a ridiculous leap and I'd not be surprised if your ears need a lot of time to appreciate the differences. Like if you've had microwave meals your entire life and then you go to a three Michelin star restaurant. You'd have no idea what it's about. Could also be that they're not your type as well as they seem to be very neutral without bass elevation. It's common with planars that you need to EQ the bass.