Cap I am finding most everyone has a little different take on this, and some seem to like to grind away more steel than others etc.
FWIW I have found my J knives just do not seem to need as much work as my old Germans did, and since they do get so sharp it seems I notice when they fall off of being tops sooner, and they just do not need as much done to them to get back to where I like them.
Except for repairing my previous sharpening errors and just basically trying to make them better I have not gone lower than my 2K glass stone and that seems to work out well, but it is only 5 months since I got them and they are used at home so they do not get the same work out or abuse as if they were used everyday in a pro kitchen etc.
I guess what it comes down to (for me at least) is if they need a full sharpening, or just a "touch up" etc. Also keep in mind I still consider myself a newbie and I am still using silicon carbide wet paper (mostly 1000, and 1200) below the GS.
Hope that helps till you get some better answers!