A new trainer is always a refreshing experience. I just started with a new coach too and I'm getting things out of my horse that I didn't even think he had in him. He was a dork today (the horse not the coach) but even so it was a successful ride, and I think that it was the coach that made the difference.
My horse is an eventer too, a good one from what I've heard, so in theory I shouldn't be surprised that I'm getting these things out of him, but when I had another coach imply that he was too much horse for me (someone so small shouldn't be riding a horse so strong in the mouth were almost his exact words) I think in my head it triggered the thought pattern of "he just doesn't have that bigger trot in him, he can't this, he can't that" when in fact the problems I was having with him were all ME, and the other coach not riding him the way he's trained compounded the issue.
What I'm trying to say is that if you're happy with the new coach, stick with them, because to get the results they must be doing SOMETHING right, and the most important thing is to have a coach you get along with. You can't listen to a person you don't like. (I know this from experience)