This is somewhat related to another thread that got off in the mud a bit. This is my experience with jigs. The first picture is a chisel in a MRk II jig and that is a .0025 feeler gauge under one side. The other side is touching a diamond plate, back side. The second picture is the same chisel in an Eclispe 36 jig and that is a.008 feeler gauge under the same side of the chisel. The wheels of the jigs were held as solid as possible to the plate. If you keep the jigs feet on the ground, so to speak and keep pressure off of the bevel the chisel should remain close to the plane of the jig. If you push down on the bevel you will rock the jig on the wheel. This chisel would have to have the side touching the plate ground down to meet the side with the gauge under it. The last time this chisel was worked was freehand about 15 years ago probably on a soft Ark. I carried to the field with me. My take on this is keep your pressure off the bevel and on the jig to keep it flat on the stone and let the jig do its job.
Jim