I suggest two things.

Water squirt bottle. Since you are worried, and since you don't know how to scruff (I'm not even sure what it IS, let alone how to do it!), the water bottle should be handy to dissuade him the minute he shows signs of moving to her food dish.

Neuter him as soon as he is old enough. That may help him calm down a little bit.

Crystal started out fine, grew into a little monster who scarfed down her food and then moved in on all the other dishes, growled and hissed and grabbed food and ran to under the bed with it. I was going nuts with her and food. She arrived here as a 2 pound nothing and within 6 months was terrorizing the other cats! I diligently used the water bottle and some how 4 months later she was back to her prior sweet self. During that time she also got spayed. What did it? I haven't a clue. But I kept making it clear that this was NOT acceptable behavior. Lord knows, the other cats were too frightened by her to reprimand her themselves. Geesh! Calicos rule, so I've heard.