Thought I'd check in and give an update since its been 2 months since I took in Waffles.
I finally saw my vet at the end of April. They did a full check up with fecal sample but no blood work. They said it probably wasn't necessary to do the blood work unless I wanted a baseline so I opted out. As for the results he is fairly healthy, no infection, no parasites, just underweight but her instructions on getting him up to weight were fairly vague basically she said slowly increase the weight of the prey till he is able to take something like a small rat and then to start decreasing the feeding frequency. After that she said just monitor his weight and make sure he is gaining weight steadily.
I finally got him up to eating between 50 and 60 gram rats as of his last feeding schedule and will be decreasing the feeding frequency by a day each week for the next few weeks till he is feeding every 2 weeks.
I'm not sure if he is gaining too fast or not but he is up to 495 grams as of today but I expect the growth rate will slow down as the frequency decreases.
My plan for once he is up to eating every 2 weeks is to feed approx 12-15% of his body weight till he is around 900 grams. after that its just maintenance.
As always I would love any feedback you would like to provide on the schedule I am thinking of and the care he is receiving so I can improve my husbandry.