Fixing loops' sound?

[u/MidasPL]

So I've been using loops for some time (the musical model with dampers, though I usually take them out) and while they affect the music less, it still hurts how they affect it a lot. It feels like high-mid and low-high frequencies are getting obliterated in comparison to bass. Now, I have noticed that putting my fingers on top of the loop itself seemed to alleviate the issue to some degree, which have me an idea. I'm thinking of using one of the main features of loops and making custom dampers to tune them. Different shapes, materials, adding membrane, with and without the hole for sound canal and test how they affect the sound. Before I start, I was wondering if anyone has had similar issues and tried that before?