Duncan Mosquito Mod

My Duncan Mosquito was my first yoyo, so it’s very special to me and I want to find ways to make it work better.

I recently took the side caps off and put blobs of clay at opposite ends of each half of the yoyo. It’s now a lot heavier and can do a sleeper much easier (it was oddly hard before that). Are there any other simple mods that people suggest?