I've read through all the posts and didn't see this mentioned, if it was mentioned, please excuse it.
I know in the past McDermott actually used NYLON wraps and not irish linen wraps on some of the lower model cues. A good example of this is the older "D" series cues. The D1-D13 (I THINK it was up to the D13) used NYLON wrap and not linen wrap, and then from the D14-D26 they used irish linen and even leather on a few, the nylon wrap will feel rougher compared to a linen wrap, at least in my opionion.
So is it possible that your McDermott cue actually has a nylon wrap and not a irish linen wrap on it ???