Wow, ok. Most people stick to the Munson Plan, as corns will eat anything and everything and gain too much weight if overfed.
Seems like your guy did need more if he was losing weight like that.
Two thoughts though.
1. Have you checked for parasites? That seems like an awful lot of food for a corn his size.
2. If the answer to #1 is that he's clean; if it ain't broke, don't fix it.
Below is the munson chart, in case you haven't seen it.
Good luck and keep us in the loop!
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