Well in general we also run 12mm plungers on some other projects and getting power over 70mg/stroke fuel is close to impossible even with a original BOSCH produced PD parts and here is why. In order to get more fuel in from a bigger plunger you need bigger hole size nozzle so on that point fast injection big hole nozzle verses bit slower injection with smaller hole size nozzle the outcome is the same in power if the lift of the 10mm plunger is relative fast like on the last cams we use on the Scania making 2000Nm more than compared to the older type cams.
Don’t be silly on pilot injections they are only there to worm tings up wasting fuel on full power only used on cold start and cosmetic noise reduction on hi CR engines with small injectors. On a big injector idle fuel is close to injector response time so attempting to pilot fuel in is not consistent or makes idle and on and off thing as impossible for small quantity of fuel delivering and lowering fuel pressure could help a bit still big chance your pulling loads of white smoke on cold engine doing so most dedicated race engines run only main injection running smooth as silk.
Yes we can over fuel the Volvo engine easy but with a EGT of 800 and short on exhaust volume not a good plan to cool things down. No need to cool things down as all moving in there a steel pistons