Once a razor is shaving sharp, I'll work it only with the .5 and .25 micron pasted strops. Since I use the baber's thumb test, I test every 10-20 laps (fewer as the edge gets sharp) and I can feel the edge improving. When I reach a point where there's no improvement, I move from the .5 to the .25. When I stop getting improvement with the .25 I move to the unpasted strop.