Greys are tiny by todays standards, we now do injectors twice the size that will run teh same emissions yours do now, namely, 0.3% at idle, cruising everywhere at around 15:1 with no problem at all. In fact, ive got my own car running well at 16:1 at the moment.

There is a topic somewhere that may help to explain what you need, i will look for it and BTTT it for you.