I don’t think I understand the question. I don’t write much (or very well), but I’ve read a lot of drum music (a long time ago) and all I can think is maybe you haven’t. If that’s the case, then maybe this will help. It is one bar (measure) of drum notation. The cowbell part (what I think you are asking about) is above the staff and in a pretty common form. The high-hat part is straight eighth notes, the bass drum and snare are “rock pattern #2” (I made that last part up). sixteenth note cowbell part
Wish I could help – I don’t really write drum parts, although I’m familiar with the manner in which they are scored. It sounds to me like you’re asking two things above, though: how to notate the rhythms accurately; and how to get around the masking effect of the cowbells. I’d use a good EQ to filter some of the sounds that get in your way, and I would personally (given that I’m not experienced with notating complex polyrhythms) slow down the track maybe by 50% using something like Transcribe! (which has a good EQ filter as well).