I have had my now 6 yo lusitano in dressage training for a year now and have only recently begun to ride him myself 2 times a week. I brought him to this trainer because he grabs the left side of the bit and doesn't move off the left leg. I couldn't keep him on the bit so off to the grand prix rider we went. He has been doing wonderfully with her riding him. Me, after about 15 minutes, not so great. She rides him with rowel spurs and I do not. Once he realizes I have nothing to back up my left leg he ignores it. I asked if I should be using the same spurs she is using she replied no, "it's not the spurs it's the timing of your aids." but before she gets on him she puts on the rowel spurs. I have yet to get my left lead canter because by the time we get to the canter work I can't move him into the outside rein.

. Suggestions please?