Didn't they bring out they MRR wedges with a more rounded leading edge? Perhaps this might be the option if you want mizuno but struggle with the MPTs?
Got a 54 Mizzie MP-R Black Nickel and a Cleveland 588 DGS 60 degree lob. I use both from the bunkers depending on conditions and how far the pin is away from the ball.
In this modern age there is no such thing now as a sand wedge, like the old days with a 56 degree club.
I'm in the market for a new 56* wedge as well. I've had a look at the MP-T and the MP-R and think the R is a much more playable wedge. The grind on the sole allows for more creative shotmaking around the green, I'd imagine.