Please don't think it was a criticism. It wasn't.
Dave Yates running out of tubing to achieve your request of a Rear wishbone, so sourced his tubing from Roberts makes sense.
What confused me completely was the ref to the Roberts Dogs Bolox, the DB doesn't use any Reynolds 653, its uses Reynolds 753 and Columbus SL for this model year and is silver soldered with a two piece approach much like a Bontrager.
Our rear Seatstays look identical to me, and the fact it is still Reynolds 653 demonstrates Daves thought Process when choosing steel and fabricating his approach to what others like Dave lloyd and Chas Roberts were bringing to market at the time.
What you have there my friend is a sublime ride, which im sure is the reason you have kept it all these years , and not just for its provenance.
This is a BOTM winner for me.