I think by now you sould've gotten the message:
Do not give the priority to a slower/smaller aircraft. On the 777 most people would gladly give you .85/330kts in no turb conditions. And on top of this 777 is usually at a lower level.
I do not pretend I know anything about the ATC job, but from a pilot's point of view some of the delay actions seem rather strange, to put it mildly.
Hope to suffer less of these "reduse to .78" nonsense!
Cheers!