Thought I would report in after my ride home on Saturday.
I am happy to say that, not only is there now a significant improvement in the low throttle behaviour, but the overall result is also a big step.
Previously, as you know, there was a noticeable lack of response under 3500, however, the acceleration is now way smoother, and quicker. It is really is very clever.
Thank you so much for all your time on this - it has been very interesting spending time discussing all this stuff with you!