That should be enough to keep him from being hungry. If you're doing once a week, you might want to try every 5 days if you can. That'll keep him a little more full and help with the growth...147g is a little on the small side for his age, IMO.
My understanding is there is no definitive report on python nutrition needs. Some people claim rats are better, some claim either rats or mice are fine. When your snake reaches adulthood, I can say, you will find it much more convenient to feed him one rat than multiple mice, so you might want to switch him over for that reason alone.
The temps look good in your setup, what's the humidity at?