Oh, I see - you were looking at BiS, not BiB.
You have it set to a 30 second fight. With a very slow weapon and such a short fight, 1% attack speed increase isn’t actually going to give you an extra auto attack. That is the problem you are running into.
If you assume flurry is up all the time (which it isn’t, but we’ll just say it is for best case scenario) a 3.8 attack speed weapon is going to give you an attack every 2.923 seconds. In 30 seconds that is 10.29 auto attacks, so 10 auto attacks.
If you put 3% attack speed on weapon, 1% on hands, and 1% on legs, you would get an auto every 2.784 seconds. That would give you 10.78 auto attacks, so still 10 auto attacks in the fight.
They are of zero value in this case. You need to do a longer fight for them to have any impact on your output.