After using the cleaner for a few years I have found that because the chains last so long and I guess that the masterlinks pins are harder than the normal pins that the ends of the chain get ovalized. I can feel when the link goes over the cassette cogs. What I have done is at the 8,000 mile mark when the symptom shows up I cut the ends off the chain and add 4 new links. This solves the problem.
My tourer 7 speed has just over 16k miles on it and I have done this twice.The chain has less that an 1/8" wear in 48" of chain.