Specific frisbee training question

I've trained my 6 mo year old Mini Aussie puppy to catch a frisbee in the air, but only if it's a really short distance or if I use commands to move him in position away from me so he's far enough away to catch before I throw. I can't seem to get him to either start running before I throw the frisbee OR, even better, start running fast enough as soon as I let go that he can get there in time.

Does anyone have any tips on how to get him to learn that he needs to run faster in order to be in place to catch the frisbee? He's definitely trying, jumping at it and such but he's also not running as fast as he is capable of. So it always falls in front of him.

Thanks in advance!