Experiences with Ivan Kit

[dueruote]

Do you know if you have an ignition advancer fitted, these can make a noticeable increase to low down pull but it's not night and day, and I doubt is related to your problem, but reverting to the OEM ignition plate if you have an advancer fitted should make some difference?

It's the original pick up coil disc.

I was thinking maybe worth to try original diaphragm springs in the carburetors, or less aggressive length cut.

Also, the fact that I drilled both bypass holes is still in the back of my mind.
Can't say what impact that makes compared to drilling just one.