My thought is that the shape of the diamond is different on these 2 cartridges. Is it possible that record wearing from being cut by a different diamond caused tiny particles to clog up the hole the cantilever is poking out of? Do you use a long hair bristle brush? or a short hair dense brush? when you clean stylus. Also, I think always using a wet cleaning brush could cause the moist cantilever to attract dirt!
Matt M
Matt M