Just weighed mine that I had already added some bronze filler to to fix the side to side slop in the guide slot and it's 100 grams after all that!
Now on to the 1mm pre load, lets examine that, is it allowing the piston to get a head start to terminal velocity before building pressure? Seems you have some way to measure this stuff, so if you have time and inclination how about a 2mm and 3mm pre-load and results? Who knows perhaps all we need is a push rod device to preload the pellet a bit deeper? Kind of goes along with my pressure reliief theory to let the spring get a head start before the piston hits backpressure and much easier to do.
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