Sure,
Lets look at the two WoL parses you provided,
1)
http://www.worldoflogs.com/reports/h...7do/details/7/
2)
http://www.worldoflogs.com/reports/6...vtu/details/6/
In parse 1) you have done 130 yellow hits over 190 seconds, which gives us ~0.68 attacks per seconds (ApS) which is 32% less than the possible maximum rate of 1 attack per seconds.
In parse 2) you have done 77 yellow hits over 105 seconds for ~0.73 ApS, 27% less than optimal.
There are only two explanations - you didn't have enough resources to utilize every GCD or you're bad/slow at decision making+button pressing. Now, I'd like to give you the benefit of a doubt that your decision making is fine and you utilize the built in action queuing feature to the fullest, which leaves us with the assumption that you are indeed resource bound.