There is even more:
In my case: Everything new: GPs, injectors also balanced, valves adjusted and brand new IP, timing adjusted by flow pressure method.
The compression check showed a 2 bar lower #3.
Everything well in tolerances, the engine runs pretty well.

Last week I touched the elements (individual fuel quantity for each cylinder).
Why?
The IP (brand new) is adjusted to deliver equal quantities to the cylinders, so far so good.
BUT, this pump does not fit to my engine!
(My single cylinders can not produce the identical output with identical quantity of fuel, because as you know my #3 is different in compression).
First I took the mV reading of each GP and I found GP #3 giving only 9.xx instead of 12 – 14 of the others.
I loosened the holding flanges and turned the elements according the mV reading of the corresponding cylinder. All other mV readings changed too by touching #3. But at the end of the day I had all 5 around 11.x mV with a max. difference of 0.3 mV.
Not yet road tested but the idle is smoother and response better as a first impression.
Further I noticed that “idle smoke” (not much but common with vegoil) disappeared completely.
The fact that my balanced mV value dropped compared to the max. 14 before and the range for adjustment is pretty limited took my fear of melting a piston caused by too much fuel/heat. IP internal influences among the individual quantities resulted in max. balanced values below the max. ones before adjusting. (setting of #3 holding flange is in max. position). Maybe only the full load adjustment together with max individual quantity might be able to increase heat above safety, maybe.
My personal opinion is that this fine tuning is possible if not necessary for most of the engines (except the brand new ones or those that are worn balanced), all others need (in my opinion) an adaptation of the elements to the status of the belonging cylinder.

Feel the difference.

Tom (WestCoastGermany)