maybe eats too fast, or to much at once? Or there may be something in the one you are feeding that does not agree with him? try a smaller amount, and a different food, maybe even a different protein? but at least a different brand.
If he has not had a vet check recently i would recommend that as well. sometimes something is wrong and the throwing up when eating is a symptom. Wet food is good for a cat, and they should not throw up unless there is some kind of problem. Be it the food, or a physical problem with the cat.
Raw food is easier to digest than cooked because it contains natural enzymes. If you’re not squeamish about feeding it, it can be a great diet for sensitive cats. Just make sure you feed a complete and balanced meal.
I agree with Duckpond that it would be best if you could take your kitty in to the vet to get checked out. Throwing up consistently after eating isn’t normal. The cause could be several different things, such as a food allergy or intestinal parasites (bring a stool sample so the vet can test for worms).
I'll add one other thought on this: cats' stomach sensitivities can be very individual and very odd so reading labels and comparing ingredients can help in figuring out what to avoid in another food. It was dumb luck, for example, that helped me figure out that potato was what was making our cat vomit. Potato doesn't seem to bother a lot of cats but several other Cat Site members have said their cats can't eat it, either. There are plenty of other common canned food ingredients -- like carrageenan and peas, not to mention individual proteins/meats and grains -- that can make cats sick so it can take a fair bit of observation, with trial and error, to figure out what's going wrong.
All that said, as duckpond
mentioned, a vet visit may well be in order, particularly if your cat isn't young. I hope you're able to resolve everything!
Another vote for a vet visit just to rule out any underlaying medical issues.
If nothing comes back, then try different novel proteins and limit fillers. Things like peas, potatoes, grains, millet and such that cats don't really need but many companies add are common problem items. Outside that, some cats have problems with specific proteins. Which is why trying something your cat hasn't had, like rabbit, kangaroo, or bison, can be a good idea.
I know with our boy who vomited frequently we found that if we excluded poulrty and shellfish he does just fine.