Food drive - too high?
I'm hoping to get into some classes in the new year. In the meantime, I want to do some tricks and practice Sprocket's OB. He's generally well behaved, and learned well using a clicker... but I've noticed that as he got older, his food drive grew and he has almost no attention for ME if there are treats out. At the dog park, he identifies humans with treats and begs incessantly (worse if they're "nice" and give him any), and it's the only time he ever ignores MY commands (down, come, etc.)
I've struggled to shape or even lure more complicated tricks with him - he seems so focused on the food (even low value kibble or similar) that he has no idea where is body is. I gave up trying to teach "bow" when I couldn't even shape/lure a nod of his head. Typically if there are treats in my hands or he knows we're "working", he starts offering all his behaviours (sit, down, roll either direction, eye contact, shake either front paw), and ends with sitting and intense focus on me (I try not to wear a treat pouch, as he focuses entirely on that instead).
If I, for example, ask for a down (even with a hand signal as well as the verbal), he downs and then rolls - when I say 'oops' (his no-reward marker), he rolls the other way and sits up, paws at me... On the other hand, if we're not working/there are no treats, he will down pretty quickly on just the verbal command. I recognize that means I need to proof these commands, but I guess I need suggestions?
He's not particularly interested in a ball or tug - not enough for it to be a reward. Is there a way to actually lower his food drive? Do I just need to be more patient? I try to be calm and quiet during training, as he gets frenetic - should I be more energetic instead?