I don’t know enough about deathcurl to diagnose it at this point in my ray experience. But what I understand is that the curl is more of a consistent curl, rather than an undulating of the disc. When I picked up my first pearl it had its front up really consistently and it freaked me out. So I went to my books and concluded that he was sitting close to the current from the wave maker and that was holding up his disc.
My personal opinion is, stop pissing around with it and moving it all over. Let it settle in and add some surface agitation to raise your oxygen levels as much as possible. Don’t fuss with your current media or you will loose all the B.B. that is already on your sponge in the filter.
if it is eating and scavenging for food, just relax and let it settle. You might be stressing it out more than it needs to be.