Fiddlesnarf

Here is my armory http://us.battle.net/wow/en/character/azgalor/Fiddlesnarf/simple I am nearing 27% Haste and have been considering switching gems to a more Pure Strength/ Strength+Haste gem setup. I'm wondering when others have considered, if they have at all, when to stop gemming Haste, and your thoughts on the subject.