I'm a relaxed cowasher and last summer when i was deep conditioning every other day and cowashing every other day I had that mushy feeling. It was very distinct and I finally understood what everyone was talking about. Anyway, I fixed the mushy feeling by cowashing once or twice a week with aphogee 2 minute and using my non-protein conditioner for all of the other cowashes. I was able to fix the problem within a week I think so I had no damage. So to answer your question, yes it's possible for relaxed heads. Hope this helps!