It’s easy to overfeed cats when we dont understand what they want because food works temporarily for most “asks”. It’s almost never food they actually need, usually it’s some sort of stimulation like playing and hunting. Try playing more with him! Especially the part about him biting your hand when you pet him means he’s activated and needs an outlet for his energy. When you pet a cat, the rougher you pet and the bigger the area, the more energy you put into the cat - eventually it’ll overflow. Small scratches, and soft small pets on a small area works better to calm them. Even just putting your hand on them kinda heavy and barely moving it.

Different cats like different plays, but for almost all cats it’s best to put most toys away and bring them out when you play actively with them. Rolling balls or scrunched up paper, wand toys, ribbons… try different toys, and try getting the cat to move around, jump up and down furniture, roll, pounce etc. If playing with a laser, point it at a pile of food or candy occasionally and at the end of play so they can successfully “catch” something, otherwise an unwatchable dot will only build frustration.

Scratching serves both to stretch, file claws , and to scent mark. Put scratching posts and mats in the area next to the furniture he wants to scratch, so you can redirect by putting him, or his paws (or luring him there with wand toys) on the scratching place when he starts scratching furniture.