Okay I correct myself. Use the max damage that should have been put in place. For instance we all know that a 3rd level spell should do less than a 4th, but yet the same damage cap. So what do we do? Up the dice size as well. Progression as follows:
5d4, 10d4, 10d6, 15d6, 15d8, 20d8, 20d10...