Had a some time today, and I tested 10 different pumps using a RBX block this time, just as Lee did.
Lowest pump was still 5.8L/M
Only thing I can figure now, is Lee had some particles in his block.
This happened to me when testing a TDX block once, turned out to be hair.
Maybe Lee was using 3/8 ID fittings?
I also tested our flow meter, using a 19L water bottle, and it seems fine.
Sorry can not explain Lee's 5.2 L/M numbers
If someone else wants to test, I will send them a pump.
It maybe no big deal, but we want to make sure our claimed performance numbers are correct.