It doesn't really take that much effort to use the shift key to capitalize properly, and it would greatly improve the readability of your post. Please do so in the future.
a drop in raid dps for your 3 warriors can be a lot of things. it could first be RNG. secondly, it could be that you are missing a raid buff from one week to the next which can have significant differences. it could be you forgot to setup your draenei correctly or they died on fights. also if overall people are slacking off in one raid even the people who ARE doing well will have less raid dps for the night because the kills take longer (heroism/bloodlust, along with other cooldowns, then become a smaller percentage of the total fight reducing personal dps of those giving it their all).