Holy crap! That’s monster stone. Definitely give any and all lubricants a try as well as burnishing to varying degrees. Really easy to walk it back to a 400-600 grit finish. Also be careful not to slap the stone with the razor come off the spine during a stroke, the cutting action is so slow you’ll never be able to correct a mistake with a hard ark set up to finish razors. Best to walk the edge back to your prefinisher if that happens.