I reckon he dounds pretty normal and gorgeous.
I think he is definately making up for his lost kittenhood and he will slow down in time..........a long time
He sounds a bit like Mosi and Riley who seem to be very active.
Franta is 14 yrs old but he can be up most of night and then after a short sleep be hassling for attention all day too. maybe some cats dont need as much sleep.
I would watch the quantity he eats cos 6 pouches a day sounds like an awful lot, does he have dry food too? if not I would start getting him some good quality dry food and leave that around for him but drop out two pouches of food.
Do you feed him on demand or is he a grazer like mine.
He is still avery young cat and think food issues are definately a throw back to him being hungry as a stray. Keep an eye on his weight and changes to diet do slowly.
You have only had him a very short time and I expect over the next 6 months he will settle and start to understand that this is his home and he doesnt have to compete for food, he will never be hungry again and play sessions are such fun and he wants more more more