Like most things WE personal preference comes into play. I have not gotten really good at stopping so tend to not do to much, just enough to round over and polish the area at the bottom of the bevel as I have a similar problem of round the edge.
To answer your question, I if the main bevel is 17 then I strop at 15.5 and try and use light pressure. By light I mean just a tad more than I might with the lapping film. I also check the apex with a bright light to make sure there are no shiny spots as I progress. If so, I stop and drop back to the last stone. Since I am not doing anything other than kitchen knives, I normally would be done after restoring the edge. The bottom of the bevel will still be polished from the stropping and I know my edge is now sharp again. Again personal preference.
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