... So, anything in there that you might incorporate into your current approach to help people in the future?
On aging systems and also in case of FD refurbishment, the things you talk about in your post can, of course, be relevant. I've refurbished quite a few FD‘s over the years, never without checking their alibration afterwards. And in about half of these cases, I had to recalibrate them … and reused original EHA‘s often needed to be adjusted too.
For now I suggest to focus on the remaining problem of the OP‘s car … “lack of power before the car heats up“
. And taking care of the matchingly missing, but necessary, proper signal to the CIS-ECU to activate acceleration enrichment (as confirmed in post 104) should be the next step, shouldn't it.
And, as I said, if that does not (completely) fix this remaining problem, I‘ll suggest specific EHA tests. And the results of these tests would determine the further approach … possibly including things you mentioned in your post.