For a dog just going from FTP to mini-T, it should be trying a little harder to get to the back pile.
I think it's got a couple more gears, that it isn't showing.
That might not be a big deal, except for the fact that the dog is now being stopped, and cast to over piles.
When you start doing counter-momentum stuff like that, you need to be able bring the dog's momentum back up real quick.
And I don't get the feeling that the OP can.
I don't think that he is ready for the step he is moving into.