Am I feeding enough

Graham is now almost 5 months old. I never had a cat that eats like he eats, he is always looking for food. He has been wormed and is last stool was negitive a month ago at his 2nd kitten appointment he goes in this week for his last kitten shots and rabies. He currently eats about a can and a half of wet food that I split up into 4 meals. He gets wild calling and/or Merrick BG or Hound and Gatto's  among other GF wet foods I like to switch it up. I also give him on occasion raw venison, chicken gizzards, hearts and livers. He gets half a can of the wet in the morning around 7am, around 3 he will get 1/4 of a can around 6/7 pm he will get anther 1/2 can then before bed around 10 I will give him another 1/4 can. Is this enough? He doesn't look skinny or fat his weight right now is good but I don't want to over feed him. He will eat anything off our plate hes worse than a dog trying to keep him out of our plates while we eat. I have to lock him in the bathroom. Sometimes I will give him a little bit of TOTW or GO dry food as a snack in between.

I think the best way to put your mind at ease is to know how many calories you need to feed him, make sure he gets the proper amount of calories by reading labels - and weighing him on a regular basis.  But I wonder if he can go to two cans? Just a gut instinct thing based on the fact my smaller 12 year old should eat one can a day (5.5 ounces). Kittens eat a lot more than adults, as much as 2x or more.    Ask your vet about his caloric needs and how much to reduce to an adult level once he grows up. 

This article has details on how to calculate the daily caloric needs for a cat.  It takes a few minutes and some practice to work through it as you need to plug in numbers to modify for age (scroll down to the chart at the bottom).

http://www.littlebigcat.com/nutrition/healthy-weight-management-for-dogs-and-cats/

Or ask your vet to give you a number.

ETA: my 15-month old is a munchmouth too.  Sits in the middle of the kitchen floor most of the day hoping a morsel of food will come his way.  Some of that could be boredom too.