Welcome to the forum. You need to determine if continuing with what you are doing is making the situation better or worse. And, this needs to be done with minimal blade loss.
Jeff's advice about lowering the universal service bar to verify that it is parallel to the stone is an important first step.
The Tormek manual advice of using a sharpie marker on the bevel is solid. in this case you are using the marker to determine if the grinding is square, rather than verifying the angle of the bevel. You need a good square for reference. A high quality small machinist's square is a good investment. It can verify the wquareness of both the edge of the blade and the squareness of the blade in the jig.
Once you determine that either the blade is square or out of square, blacken the bevel. Put the blade in your jig. Turn the grinding wheel by hand with the power off. Look at the bevel. If the blacking is being ground off the high side of an out of square blade or uniformly across a square blade, you are going in the right direction. If you are indeed moving in the right direction, proceed slowly, checking your work.
If the edge of the stone has been dressed square to the face of the stone; if the universal support bar is parallel with the edge of the stone; if the blade is inserted squarely in the jig; and the blade is parallel.....your edge should be square.
Keep us posted.