Found something on the range today. I really think this is it.
Most drives went a bit lower and much straighter, even quite a few of those that I pushed a little had a faint draw on them.
There still is a timing issue, pushing or pulling the drives, but not any bigger slices, just a few fades. And it seemed extremely reproduceable. After hitting about 7 buckets I went in for lunch, then practiced putting and chipping, then I went to the range again and hit 4 more buckets, and it was as if I had had no break at all.
So look up for me posting 40+ stableford scores in the 'wadaya shoot today' thread in the coming days.