All of this is golden, thank you so much. Unfortunately right now I am blocked by sub-zero temperatures where I live but here's my battle plan for next week, hoping for a more forgiving weather:
1. Replace the injector that had a slight leak with the new one I got in the mail, after testing it on the bench, and see if that leads to any improvement
2. If no improvement, swap the pump with the old one the engine originally mounted, which I still have with me. I think that would be the easiest way to assess whether the pump is to blame
I'm also thinking of running the engine with coolant up to operating temperature in order to see if performance improves once warmed up. Stupid idea given I still need to break in the pistons? I read on the page @ngoma linked that ideally the engine should run as little as possible before being put under load, in order to ensure proper break-in.
Thanks again for all the info and tips, I will report back once I have some news
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