Hm, I get what you mean... but I'd rather cut out some stuff rather then alternate that way (That's just me though, there isn't anything wrong with either way). Are you going for points or hoping for a champion/reserve? If so, I'd stick to the same divisions. Plus it might be easier for him to stick to the same heights each day. If your horse is ready to do the 3 and 4s, I'd just do that. If he needs a bit of prep, I'd start of the 2/3s, and end the week in the 3/4s. If you're worried about him getting too tired I'd either cut out the hunters or only do 1 jumper class a day. But that's just me!