I also have this crate. It flies extremely nimble, and is, tailheavy with the stock setup, and battery.
here is a good solution that will help balance it out. Get a bigger (heavier) battery. You said you use a 1500? get the 2100 3s1p from thunder power, or the 2200 3s1p from Polyquest. Either one slips in with little or no cutting, and helps a great deal in balancing. Also you get longer flight times
Another way to balance it out: get a bigger motor. I have successfully flown with near vertical performance, a johnson s600, 2200 3cell lipo, and a 10x5 prop. It was truely ammazing for 5-6min. Then my esc locked up my controls!!! it porpoised, and dove at 45 to the ground snapping her in half! more epoxy.
Once I can afford a 30amp esc the johnson goes back in
I think a s480 would be almost perfect, it would eliminate any "dead" weight. You would gain some thrust, and balance out correctly.
Another trick? Use a gas prop...they do not break in a crash, and help the cg. I use these gas props a lot for testing. they will not break...the shaft bends first...You can straighten the shaft right back, at the field, with your hands!
Just some solutions to a common problem.
"these are my humble opinions after throwing too much money into crashing."
p.s. I flunked spelling. If you have some pet peave about spelling than tough titty....lmao.