I understand your point, I do. But, from my perspective, if you dropped me in a time machine in 1996 (ohmygodthats18yearsagoiamancient) and told me to win a tournament series, AGD would have been at the very forefront of the options - as a tool, I prefer them to cockers. I actually think cockers are more fun to shoot, but a mag seems like a better tool to me.
The thing is, they're BOTH evolutionary dead ends. Cockers don't really have a logical modern descendant. E-cockers suffer much the same fate as E-mags - you're grafting on a bunch of extraneous stuff instead of abstracting and simplifying.
The Automag, on the other hand, is in a lot of ways a logical precursor to the "Dump Valve" style of unbalanced spool. You shouldn't be surprised it gets similar efficiency to your Geo+ - they're both dump chamber unbalanced spools. If you lower the pressure, and make the sear a pneumatic sear....they're practically the same gun (though the mag saves more chamber air due to spring equilibrium, and the Geo has a better flowpath).