The 2.5 is pretty good, just has the torquey to be okay daily, but when you rev it it's great.
I went out to clarify what I'd said here just in case. I couldn't repeat the improvement
. So it looks like it's back to the drawing board.
Why do you say you think there's more improvement possible from the ignition timing? My car has a 7 position switch for the ignition timing.