Good luck on the number... or perhaps I should say, "take a number" on getting your number.
Meatbag? I love it. I got called a "Spector fanboy living out some proxy butthurt victim complex" by an angry Warwick Streamer player this morning. But of course I also totally hijacked a WW thread in the process.
The issues with the bridge is two fold. You can find plenty of bridges that are heavier and would have the proper spacing. The Hipshot Type A is one (also used on USA Bolt-ons). The issue is the routed out recess the bridge fits into. Most aftermarket bridges are designed to sit flush on the surface of the bass.
The USA bridges, while heavier, are too large and most likely won't weigh enough to offset your neck dive issue.
I'd take your guitar to a luthier and see about having them punch some small holes in the back side (where the back strap lock is) and they can insert lead rods into it to give you the balance you are looking for. If done right, when they clear-finish back over the tiny hole(s) they drill, you won't even see it.
It will add weight to what is already a pretty heavy guitar. But that's going to be the less damaging. Mess up a bridge retro on a Spector and you've got an exensive paper-weight... door stopper... firewood... you get the picture.