Puppy keeps biting toes

Hello,

I have a 12 week old puppy, hes great. Training is going really well for the most part but im having one stubborn issue. When hes excited he goes for my toes! He knows "leave it" when hes not excited, he ignores it otherwise. We train "leave it". When hes calm I train calm by praising him or with treats. We have done the run away game so he doesn't jump when hes Calm but as soon as he gets the zoomies its straight for the toes or my pants!

I've done redirection with another toy, ignoring with my back to him (doesn't work as he chases and then bites my toes), time outs, But nothing seems to stop him. We could be playing and next minute hes on the toes! I wear shoes now so I dont react ( it hurts) but still no luck so any advice is welcome!