Lyra recommends between 90ohms and 47Kohms for your cart. I really think you would benefit from somewhere in between, especially if you're trying to improve your bass. The bass will improve while the treble gets less strident as you decrease the load. (going from 47K on down) You would appreciate it since you've got the arm dialed in. Can you sling solder? I would ask Ken where to solder in some loads. He has no doubt helped other owners of his fine preamp with the same issue. It's a very common problem for vinyl fanatics.
Sorry for meddling, but just trying to help, since you're trying to get the max out of your setup.
Sorry for meddling, but just trying to help, since you're trying to get the max out of your setup.