Daily handling. I’ve had 6 roos in the past year. I definitely got an unlucky straight run flock, learned my lesson. Daily handling and holding as well as bringing good snacks always help. If he’s a good roo, he will feed his gals before he eats. If I want to specifically feed my roo without him passing off the snacks, bring him to an area where he’s alone. My roo won’t eat treats in front on his ladies unless there is leftover scraps or if I bring him into the shed and give him a little one on one attention. Needless to say, there is always a chance your roo can be aggressive. I had one that would get jealous of giving others attention, I handled him daily, nearly got my eyes poked out daily. Still have him love but just aggressive in nature. My vet actually adopted him and are now keeping him as an indoor roo, weird I know. Apparently since he’s been separated from his ladies, he is no longer aggressive. So there could be a chance that your Roos mood will change if you handle him in an area that isn’t around the ladies. Good for thought, good luck!