Remove the stun portion of Shoulder Charge or change it into a silence and reduce the cooldown to 30-45s.

Remove the stacking effect of GL and just have Enhanced Greased Lightning 1/2 read as 14/21% damage increase and 10/15% increased attack speed.

I can't think of another class that relies so heavily on a buff that takes at minimum, without CDs, 18 seconds to stack. Just stack the effects and keep it as a one buff thing.