Try using your light horse and dragoons to keep him from double moves. You can shoot him every turn and when he charges bugger off, then come back and do it again. I have found my LH very effective in FOGR, much more so than in the ancient period. Gotta love all those gunpowder weapons.
Not sure if it will help a lot but what about using FF's, puts him down a POA for impact and melee, he has to stop 1 MU out before he can charge so you get 2 extra shots at him to whittle his numbers down. Never tried them myself yet but it is a thought.
Also you might try to stick in a lot of terrain on table, especially the difficult stuff, it seems to have worked well on Blatherguts numerically superior armies.
Other than that, a napalm strike perhaps.... or see if you can find the Davinci list and try adding in his tanks and flying machines
