Definitely look to upgrade to CF landing gear as well. And since you will be running a vibration-free electric, consider taking a dremel to the airframe. I took 13 ounces of wood out of my QB 260 with little effort. I am sure there is at least a pound to be lost in wood alone. I have only seen a GR85 on Bonedoc's Dalton, which last I remember was a tad over 20 pounds. By the video it has very good power for a 20ish pound plane:
You already have 19 pounds in airframe, motor, and ESC and are looking at another 10+ pounds in battery. You are already at 29 pounds before adding the 2 pounds in servos, horns, extensions, receiver and rx batteries(assuming that you use VERY light batteries, like A123 1100's or 1320 lipos), another .7 pounds in prop and spinner, .3-.5 pounds in engine mount/hardware, and the ever-present "fudge factor" of anywhere from .5 to 1 pound.
I know this plane is pretty big, but 32-33 pounds would make it a slug, for both the plane and the powerplant. My advice would be to try to keep it around 30-31 pounds, which is about what the take-off weight would be if it were a gasser with 32 ounces of fuel. That should be light enough for the plane, but not sure about for the motor. But that motor is only rated at 147 amps max, so I don't understand why you need 15 amps of battery??? You could drop 3.5 pounds by going to a 12S2p configuration and would still only work the batteries at a max of 15C.