Originally Posted by Bianchigirll

Normally the rear axle is centered over the mounting bolt for the RD. I don't recall the exact dimensions but I believe there was something specific for Super Record era and since Chorus is still based on that is seems to make sense. If you max cog isn't over 27T you don't really need to use the B position.

As others have mentioned Synchro was finicky and once I learned it was never going to shift like Suntour I learned to over shift and use the clicks more as a guide rather than simply relying on clicking. I eventually went to Retrofriction.