Only thing I can think of at the moment is have each debuff reduce your damage cap by 10% as well making a certain amount of each debuff needing to be determined

I still strongly think debuffs should be limited to one of each if your attacking someone stronger than you it should be hard work.

Then high ranked people will be safe from noobs...the flaw of a level based game. (high levels get more AP/hour)

isn't that the point of being a high rank? There aren't many games that i know of that a rank 300 could take down a rank 1000 with ease they may still be able to do it but it's supposed to be really hard.