Hi and welcome.
Very cute kitty.
The only thing abnormal about what you are describing is that he sounds amazingly restrained for a bengal, and that he doesn't do more of it
But you may see him ramp up that stuff in the months ahead.
I've come to think of bengal kitten's antics this way: Why does he do stuff and what is he trying to accomplish? He's desperately practicing to become the adult hunter that he needs to be. So that includes the full spectrum of behaviors: running and jumping to build his muscles and agility. Stalking, pouncing, "killing", wrestling (to ward off rivals). Plus all the defensive stuff: making himself appear bigger by puffing out tail, arching back, hissing, growling etc. These are all the skills that he knows that he needs to be a self-sufficient hunter, and he has a big need to do all of it, so when you see it, you can put it in the context of "he's in training", but make no mistake, such training is a "serious" business to cats. And that's why a toy like dabird is so great, and it's so important that you guys participate in giving him that stimulation.
The running away with the dabird thing I thought was really cool the first time I saw it. My Serafina does that too all the time. She's practicing her "kill and defend the prey" behavior. So when people suggest that using a laser pointer as a toy for cats, and that "all they want to do is chase it anyway", you will know better!
As far as the sort of "rough play" goes, keep in mind that if he were still with siblings, he'd be putting them in headlocks and toppling them to the floor, biting their necks, pouncing on them and knocking them to the ground, bowling them over during a chase, getting a flying leap and landing on them from above, and all that crazy stuff. So since you are his playmate he's trying to accomplish some of those needs as well. What your task/challenge is, is helping him satisfy those needs, but doing it in a way that doesn't hurt you. So yes, you can scold him if he does that stuff, but there always has to be a "yes" behind the "no" as to how you help him with those needs.
As far as food goes, for now I'd ignore the manufacturer's suggestion. Don't ration his food, you're feeding him really good food, just make sure that he's not hungry and can eat all he wants/needs. Later on when he gets closer to 1 year old, you'll have to start figuring out whether he's getting the proper amount of food to maintain proper weight/body shape, and your vet can help with that. But for now it's all about growth. And to answer your question, it wouldn't be surprising if your cat got to be 15lbs or so. Male bengals tend to be pretty large cats.