How many grams should my BP gain between sheds

My BP is 7 months old. I've had him for about 2 months now. I did not weigh him the first month I had him but he was a little on the skinny side. After his first shed I had weighed him in at 263 grams. I could see that he has definitely put some weight on(looks healthier now) He has just finished his second shed and was fed on Tuesday. I'm going to weigh him today. What would be a good gain for him. The pet shop was feeding him 2 fuzzies a week. I started him on adult mice as soon as I got him and he loves to eat .

He is way undersized and the 2 fuzzy mice a week is the cause.
That being said, they all shed and grow at different rates.

From all the charts I've seen I knew he was undersized you could even see his spine through most of his body. I consider getting him more of a rescue for him than me getting a pet. Now that he is getting fed the proper size meal and cared for well will he grow at a normal rate or will he be always be small. I will keep up dating his growth chart. As soon as I get some time I will post before and after pics.

Just weighed Ziggy he is now 366 grams getting bigger