Wow they are alot heavier than Odin.
Thank you for sharing, I am taking notes about everything.
Don't worry about the actual weight because they are all different. Sometimes I have a younger sibling who is bigger and passes up and older one. The important thing is that up until he starts trying to fly he should really be gaining weight everyday.
Is his crop emptying between each feeding? It does not have to be empty each time but should be getting quite empty and in the morning it should be fully empty (especially if it has been 12 hours).
Start the four feedings but when you do eventually go to three only leave 8-9 hours overnight, just space out the day feedings more.
To me the goal is to get as much food in them as you can in a day while not feeding too much at one time. As the baby grows and can eat more at a time he will naturally be able to go longer between feedings.
It looks like I went to three feedings when the babies were about 6 weeks old but yours may need a little longer, each on develops deifferently. When his crop can hold food for 8 hours without being totally empty you can drop a feeding but spcae them out so there is only an 8-9 hour break overnight.
I stay on three feedings almost until they are weaned. At some point after he is eating some food on his own you can go to two feedings a day with a 12 hours in between.