Many Top Level riders I've had the priveledge of riding under in Clinics all stress that bits do not solve problems, but proper education, riding and training does.
If all your horse is, is is heavy on the forehand - then there are holes in your education and your horses. The Waterford teaches you nothing, nor your horse - I guarantee you, you take that bit out of his mouth and he will be heavy on his forehand, yet again.
I'm not going to argue with you on the Waterford bit. I stand hard on my beliefs with that bit, and that bit is not meant for everyday riding - ESPECIALLY if you do dressage. And especially if your horse does not need it.