Just saw that you said the pins on your comb were too short for a standard - I actually use these combs when combing out the jacket of a mature standard in show coat so it is probably your technique. Comb after you have slickered and do a small section at a time starting at the skin - if you find a knot tease it apart with your fingers, hold the hair above the knot and use the comb to gently comb the knot out (similar to how you would comb a childs hair) My description is not very good - do you have Shirley kalstones book - it is great.