Sorry if I caused you pain. Hahaha
Since smaller gliders are soooo sensitive, I'd suggest you trace out your bait's profile on a piece of paper like I did, and mark the locations of the ballast exactly.
Then go ahead and paint and top coat the lure, so it's at it's finished weight.
If it just barely floats when you're done, try casting it and see if the shape of the lure, and the weight of the line, are enough to get it to glide just under the surface on the retrieve. If it doesn't you can always wrap a little lead wire around both the front and back trebles, to keep it level in the water, until it just barely sinks, and try it again. I take a spool of the lead wire with me to my test pond, so I add weight during the testing. If that's what it needs, you can super glue the wire to the hook shanks, and it'll stay forever.
If it sinks after you've finished it, put the lure back over the tracing, mark where the two ballast locations are, and drill a small hole in the center of both ballast areas, a little at a time, to lighten it.
Take two different setups with you to test fish it, one with fluorocarbon line and one with mono. They will affect the buoyancy of the lure differently, and one or the other may be enough to get it to work the way you're looking for.
Good luck.