Hopefully not too expensive to ship from Brooklyn. That said if you are pleased with the wiring harness you've installed, the gold knobs look good with your finish.
Lighter tuners are a good idea, regardless of case issues. I was quite surprised how much lighter my Jazz bass felt when I installed lighter tuning machines, because I knew it was only going to drop by a half pound or so. I think it feels like more because that weight is out at the end of a long lever bearing down on your shoulder.
My Jazz is about a pound heavier than my Precision, but feels a little lighter. I think it may be a balance issue because the P has neck dive and the J does not...