There was a suggestion to elevate Charlie's bowl to lessen the coughing/gagging and it has worked. He's also eating out of a bigger bowl and the food is floated, which he seems to enjoy. It's not helping him eat much faster but we'll come up with a solution so he doesn't take up all our morning time eating.
I think I'll drop his food back down to 5 cups a day versus 6. He's not putting on any significant amount of weight with the extra cup of food but his output is definitely increasing. We'll see how he does on five cups with added goodies throughout the day.
Thanks again for all the suggestions! I really appreciate it!