The tendonitis thing is a bummer. I have that too from repetitive lifting .It really does not seem to ever go away.A doctor told me the only thing that makes it go away is to stop doing what is causing it . Zon will help you with this .Modulus also .The lowest action achievable is the only help I can get and using lower tension strings .Iam not even sure if my DR hi beams are lower tension but I like the sound and they seem to be lower tension to me .Sounds like your happy with that bass hope it provides some relief to your back and hands.(dealing with tendinitis and tennis elbow from my double bass days).
Zon rules!
Chris