You shouldn't go up to a bigger bit. This horse needs training. If you can't train him, get someone who can, it'll be for the best. With training, you should be able to ride him in a snaffle instead of covering up his lack of training with a bigger, stronger bit. If you don't train him to go well in a snaffle, you will always be having to move up to a bigger bit, and he will develop bad habits, like evading the bit (if he hasn't already)
Maybe even try a bitless bridle
Try a Shank bit
try a rubber bit, basically try anything until you find one he listens to and likes
try not to pull hard, also remember you cant get a horse to follow you by getting a tougher bit, try retrainin him, a tough bit will only hurt or aggrivate him.
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