At the end of the day man, we play games because we enjoy them. If you enjoy playing your KFM and you're playing it as it should be played, why let a dps meter play with your head like that? At the end of the day it's just numbers, it doesn't really matter as long as the tank holds his aggro and the boss is downed before any enrage mechanics etc.
You obviously have a decent geared character that you've worked hard on, just keep playing the game to have fun.. otherwise what's the point? Seriously, i wouldn't be letting a list of numbers that can be affected by god knows what during