My group and I are playing the Thunderspire Labryinth adventure for 4th edition, levels 4-6, and our DM added in a lot cool side-quests and random encounters. The only problem is that now we are already level 6 and we're only half-way through the module. Some of the fights are becoming brutal slaughters for the enemy monsters.
Furthermore, the DM is already setting up for the next module, but we may be above the expected level by the time we hit the next module.
What are some techniques for dealing with the excess experience accumulated from side quests and random encounters?
At this point, we are just considering taking less experience than we earn per fight, but who wants to have less experience than they earned?