Bubba should be getting more calories per day. From Catinfo:
https://catinfo.org/feline-obesity-an-epidemic-of-fat-cats/#How_Much_Do_I_Feed
Dr. Pierson uses the formula
Required calories per day = [13.6 X optimal lean body weight in pounds] + 70 as a starting point. There are some differences based on activity level, age, etc. of the cat. If 13lbs is Bubbas ideal weight, he should be getting 247 calories per day. He needs at least 3.5 cans per day, closer to 4. On the Catinfo website is a page on making your own cat food. I found making cat food quite a bit cheaper, though I used a premix. Getting larger cans from a different brand might also help.
I'm going to merge this post with your other one of the day. We ask that only one post per day per cat be created, due to the large number of cats on this forum.