Ical, this is more serious than the problem I had.
Peterayer, you took me aback with the question of timing for the Walker enzyme treatment. I allow 30 seconds for this stage at the recommendation of Lloyd Walker. I can see that allowing 10 minutes per side would take a long time.
Long ago with the original VPI, I got a tiny piece of metal caught in the nylon pads and deeply scratched several records. I really didn't want to ever use such a device after that. Ultimately I ended up with a Loricraft and diligently advanced the string every record. But it took forever to clean records with the four step Walker cleaner.
I then learned about the Walker delrin tube which just replaced the entire tube on the VPI. This tube has no nylon pads and greatly increases the vacuum level allowing one rotation to be sufficient. Walker got it from a friend of mine and perfected it. It is no longer available as its manufacturing was too time consuming. This is a shame as it is very effective and quick. Perhaps Harry Weisfeld could use it on his VPI cleaners and find a quicker method for its manufacturing. I see and hear no evidence of it having any impact on the record.