It's not clear if you're hopping between two cogs on the cassette or two of the front chainrings. But if you're cadence preferences are that acute maybe you need a chainring that's two teeth larger/smaller? Can't speak to the functioning of the 10cog gear train from any experience but I'd be more inclined to stick with the 8spd for longevity sake and ease of finding chains. I've got two barcons on two bikes set on friction, one is an old Suntour that has no indexing and the other is a Shimano 9spd that I've set on non-index.