In the basics setting page, see the box 'fuel cut under kPa'? You've got it set at 14, and the MAP is dropping to 2 or 3 in places. The lower down 'overrun fuelcut rpm' and resume means it will do fuelcut any speed above 1700 (and the MAP is below 14), and resume at 1500rpm, regardless of the MAP.
Have a play with these values. My first instinct would be to set the fuelcut rpm up from 1700 to about 2500 so that you don't get fuelcut around town, but depending on the injectors that can make things worse, so you just have to play and see. 1500rpm for resume is about right. 14kPa may or may not be right, depending on the MAP you see on overrun. In your case it gets pretty low, so you could consider lowering this value - maybe try about 8kPa? This might give you better decel control (less of a step change). You can't damage the engine by changing these numbers, so have a play with them and feel the effect on driveability. These are the bits that take time to perfect, but make the difference bewteen a cal that feels like a race car (i.e. full load power only cal) and a road car (proper driveability at low speeds and loads)
But, be a bit careful with your vacuum on overrun. 2 kPa (if thats accurate) is pretty low, and could be enough to start pulling over oil if you are using a returned breather system still. Keep an eye out for blue smoke as you tip back in after an overrun, or pull of some breather hoses and check for excessive oil film. Pulling oil over is bad because it then has to be burned, which lowers the octane rating of the fuel and increases the chance of knock until its cleared. It also puts extra strain on seals (too much pressure difference across them), and finally it also makes you pride and joy look like a smokey old bus
Glad it drives well - well done. Pat on the back i think
