when he gets over exited, say no and stop the game, get up and walk off. or say no and give him a tap on the side not hard that you hurd him but not so light he doesnt regester it.
also start teaching him to leave it, hold a treat in you fingers but dont let him get it, tell him to leave or drop or what ever word yoy want to use, as soon as he stops trying to get the treat give it to him and tell him he is good, repeat this till he dose it first time for like 5 times in a row, then more on to a toy and do the same thing.
as for his kong what are you putting in it, you can put anything in it from chicken, cheese, peanutbutter, dry food, tind wet food etc, something that he realy likes. you can also freeze it so it makes it harder for him to get the contents, and takes longer to eate it.