I've had a weird screeching sort of noise from on the rear coilovers, located the noise to be coming from the gaitor rubbing on the shaft, I put a bit of red grease on the shaft and it stopped it.
You got solid top mounts?
My Ktr top mounts creak from time to time when turning at low speeds, a spray of lubricant like wd40 on the bearing stops this. If that's what's causing it.
Glad you solved it! What was it in the end?