No_method,
My partner and I concur with Tom6897. Ask him if he's ever read
my original writeup. ;-)
The bristles of a record brush are inadequate for stylus cleaning. Read that link for an explanation from Jonathon Carr of Lyra. By contrast, Roy Gandy/Rega's assertion that record and stylus cleaning are unnecessary is a concession to the deaf, the foolish and the lazy. For optimal performance, records must be cleaned before the first play and styli must be cleaned after every play.
A stylus riding on stuff dredged up from a non-clean groove will mistrack. It's not certain that this is your problem but it fits the symptoms. Lifting the stylus and cueing it back down may let some of the stuff fall off, allowing the stylus to mistrack less. Actually cleaning the groove and stylus would be better of course.
Inspect the stylus with a good light and magnifier before and after cleaning. It should appear clean, clear and uncolored (white like a good diamond, never yellow). If Magic Erasering improves it visually, it's a sure sign it needed cleaning.
As the distortion is in both channels, skating/anti-skating are unlikely to be involved, so the title of your thread was misleading. When framing a question I get less skewed results if I avoid presuming any particular answer.
Doug