You may want to try unilateral work, not only is it lighter weight but should also help improve balance stability. Things like 1 legged squats, lunges, 1 legged RDLs. As for overhead work, maybe some lighter explosive work like snatches? You will have to see how you feel on those. I imagine stronger traps will only help to support your neck.
As far as spinal issues, I know people who used one of those inverted (hang by your feet) tables and got a lot of relief from periods of spinal decompression...it may help.