Eh, I'm sorry I sniped at you. It's just that I post on a dressage board and they can be very picky... and they didn't go after me for these things. But you deserve a good answer and it is this:

I trust my instructor. I trust my horse to tell me when I ask too much of him and he is not telling me that.

If you want to talk technically about the use of the double, ask away. I will stop being defensive and crabby.