I was able to remove 1.5 lb, turned a heavy 10.5 into a manageable 9 pounder:
Removed heavy gloss finish from the entire instrument - about .5 pounds. Used a French polish instead, oil finish would work just as well.
Replaced 5 tuners with Gotoh resolite - another .5 pound saved
Sanded a belly and arm contour (was previously a slab); additional sanding on the top and back, headstock and neck which was way chunky when I started. Made for another .5
The bass balances great and much nicer to play with the contours. It changed the tone though hard to really quantity. Sounded great before, sounds great now just different.
No ugly routes, no balance issues.
Worth saying - Chris Squire had his main Ric refinished twice, in interviews he credited the thin body and neck from all the sanding with giving that bass its unique sound. Yeah I know it’s all in the fingers.... apparently nobody told him about that.....