Gallop, you have 97 carrots! How can you leave? I can hardly keep 3!
But seriously, while I understand that you are trying to maybe improve your horse and find out what seems to be work for him, it sounds like he is getting along just fine in this department. I honestly wouldn't even give him the 2 lbs and see how he does. If you notice a dip, then bring it back.
That being the case, what this does it free up your money that you want to invest in the grain and put it towards something else that you might be interested in trying or buying. Maybe a new saddle blanket, boots, bridle.... lots of other fun things.