carb balancing?

[Dead Eye]

Undertaken this task again today (3rd times the charm) after forgetting all about the restrictors on my previous attempts.

The issue I have is that they are completely out of spec - I can sync them up but they all sync to about 19-20 cmHg whereas the spec says 23-25

I'm also pretty certain that cylinder 1 is the culprit in some way. If I adjust the centre screw in favour of 3+4 the revs rise and so does the cmHg across all cylinders - this is an even increment across 3+4 then a slightly lower on 2 and only very slight increment on 1. Same sort of circumstance if I adjust the left hand screw (for 1+2) in favour of 2. 2 obviously rises but so does 1, just at not such an extreme rate. With 3+4 if I adjust then one will drop about as much as the other increases, which is what I expect to happen

So basically, what the crap is going on with cylinder 1?! I unfortunately don't know enough about the importance or meaning of these measurements to start building up a prognosis