My personal experience is that it's hard to over-feed when they're still growing. I'm not familiar as much with wet and dry food, as our cats are fed raw, but I do know that they need more dry food then raw. From his picture he still looks good! I wouldn't worry too much until a year old when they're mostly finished growing.
Kittens eat like they will never have another meal lol. We never worried about any of our kittens’ weight, but once they turned a year old, we then discussed with our vet their weight and what they felt would be their ideal weight according to bone structure etc. and from their scaled back food if we needed to.
I was going to post this too!
I feed 1/3 can royal canin kitten food twice a day, with access to royal canin kitten food all the time & of course plenty of water. My little guy will get a belly at times and other times it looks like he hasn't eaten in weeks!