I conclude its a set rate and we were just ahead of the curve. Opening day I got my 2 stacks and headed to Habere and cleaned house until I stumbled across Mits. Left again during nexus and was the same as any other time. Logged on after todays maintenance, quickly wiped out ZF in all of its full spawned, server reset glory. Then back to my Habere circuits. ZF made it clear there are large areas where they are packed and lined up 10 - 15 meters apart, so with people missing some that are hidden, also possibly a variable respawn timer; its easy to get a slow stream of scraps rather than a motherload or nothing in case you were beat my a min.