OK. This is it. Really, this time.
Just one more bit of worrying the “Achindolosk” thing — James Tempilton’s holding in 1315/6 — and this turned up. It’s the best that I’ve got, for now:

You see “Assloss” up there, just above and to the right of Dean Castle? There’s apparently a connection between that place and the Sloss family. That would be the family that discusses their genealogy on the Sloss/Assloss/Auchinsloss board at Scotland.com. I have no documentation or history of the place that connects Assloss to Achindolosk, but it would seem that a contraction of ‘Achindolosk’ to ‘Auchinsloss’ is a dern sight less a stretch than shortening ‘Auchinsloss’ to ‘Assloss’, wouldn’t you say?
Intriguingly, there’s also ‘Ralstonhill’, which is very similar to the ‘Ralston’ (Raliston/Ralphistone) which was mentioned in the Boyd charter of barony from Robert I, and there’s also that ‘Templetonburn’ creek and place name that I looked at from the highway as we passed, heading back from Dundonald Castle and Templeton that afternoon of the Ayrshire trip.