I'm checked into the B&B Hotel in Jerez, and the bike has been lightened for the next few days ... side bags removed. I'm leaving the top case on because, (a) it's kinda handy, (b) I can't reliably remove and install it ... BMW's keylock for the top case is infuriating.
I ended up with a little more distance covered than originally planned, because I got lost in Ubrique. The town is a maze of narrow one-way streets and there's no direct route for the main road through town ... which is understandable, because of the surrounding landscape. Initially I missed seeing a "no entry" sign and got several metres up into a one-way street the wrong way before realising what had happened. Then when trying to recover from that, the GPS sent me towards a road that the "policia" had blocked off. Then when recovering from that, I spotted A-373 on the GPS and dutifully followed it out of town ... which turned out to be back the way I had come in ... part of the problem here was that the GPS was desparately trying to get me to turn around and take a shorter route. But, this was fine, because the section of A-373 back to the next junction which had a building that I recognised as having just come from there ... is not terrible. LOL
A-372 and CA-9104 are incredible scenic routes.
You cannot ride fast on these roads. There's no center-line marking, the width isn't what North American road planners would consider to be a two-lane road, there's no breakdown lanes or shoulders, and there's stuff (be it buildings, trees, rock-faces, or the rocks lining the drop-off to a valley below) right up to the side of the road. Most right-hand turns are blind, and there could be a car, truck, or bus coming the other way ... these roads are how commercial goods get to these towns, generally there is no other way. Best hug the right edge of the road and keep your speed very much within sanity.
Truth be told, I was happy that the last 20-ish km into Jerez was 120 km/h motorway. I'm beat.