With the leveling stone. Have you checked it is actually level as many aren't. When lapping you shouldn't be using much pressure and using figure 8s. Is just shallow scratches on the surface it should not cause any problems but if deep yes. Also are you checking that the lapping stone isn't leaving grit behind on the 1k. When cris talks of no pressure that is weight of the blade only or less at final finishing. Light pressure is just that just a fraction of pressure to increase the friction. Remember that it is easy to flex the blade with too much pressure and that will cause problems later in honing. Hth a little. With Cris's reccomend routine for bevel setting do it once. If not there do it again. Repeat till there. The bevel is one of those things that is done when it's done.