Depending on what sidecar you use, you could consider putting a brake on the hack. Really, in order to run a sidecar properly, the front end should have a long trail thus most conversions have a leading link fork. I am sure, you could find one that fits the CB if you look around, especially as many earlier Goldwings have been hacked. I assume, you set up the sidecar with a toe-in when mounted?
It all depends on what your primary purpose for the hack is. If you travel longer distances, geometry and straight-line stability is more important. If you just putts around town, easy steering is more desirable. Both things are almost mutually exclusive.
Also, a larger rear sprocket could help the bike pulling the additional load.
I raced sidecars as a young man and had a HD rig up until 2 years ago. Will probably get one again, something a little more extreme. My dream rig would be Krauser Domani.