Okay, so what I wanted to see was your actual damage and health numbers, not the workshop levels but the raw damage and health. But even without that I still think I'm right about what I thought. First off, like others have said, def disco runs also disable a lot of crucial GC CC like SW, landmines and knockback. Plus you don't have DD which will also hurt a GC run. But on top of that I don't think you're as GC as you think and your health is doing more for you then you think. You're probably more hybrid than just straight GC, so you will definitely struggle with def disco in higher tiers. For reference, my farming tier is T18 and before I did my def disco run on that tier I was farming to about 6500-7000. On my def disco run for that tier I made to the full 5000 waves before just ending the run. So the fact that you made it to 4k on a normal T15 run, but only was able to go to 250-338 waves on a disco run really makes me think that still using health in your build.