Things slowley get better Tom. Thanks for double checking with the pump person. At this point I am glad I was wrong in some of my thoughts. Now much less chance of people doing damage when the need is really indicated. This information should have been known and used years ago. You power balanced your engine a little. Was it any better afterwards? Or was correction too little to notice? Your engine was in pretty good shape to start with other than one cylinder low by 2 bar. Did Idle smooth out a little? This might be useful with really older engines that have much different compression from cylinder to cylinder once injectors and valves not adjusted properly are taken care of. Plus using a set of calibrated glow plugs of course. The engines are not going to be smooth running with all kinds of different cylinder burn rates. If adding a little more fuel to a low cylinder gets it producing about the same power as the others the engine will preform better I think. Perhaps in the future a little yet though.