RE: Goldberg Matrix
I don't remember what mine weighed, but with that motor you should come in under 5.5 lbs..
I've seen one fly with the 46AX and it flies precision aerobatics very well, however, vertical, with maneuvers, is limited to a few hundred feet, not unlimited.
Your engine will allow a lot of 3D stuff, just the hover will be at 3/4 throttle + or -, propped correctly it'll do well for you.
Try a 12x4 or 12x4W if you have them, but you might need to drop to a 11x4 to let it spool up quick enough.
Ken