We got 10kg each into 2 bearvaults for 180 miles of PCT through the Sierra from Kennedy Meadows to VVR.
My test pack of a can last weekend got 6kg/13.2lb in without any aggressive squashing (just careful tessellation), nor letting the air out of the packets, nor pouring in loose granular items.
Just to confirm, you are talking about a BV500 bear vault, about 650 cubic inches (although it claims to be 700 cubic inches).
I've read Tom's article on this before - a must read and some very useful tips, but leaning into each layer with a glass roller tends to make mush out of everything. The most he claims to get is 18 lbs, so your 22 lbs must be a world record if you're talking about a BV500. That's truly amazing.
