Even with 5 points, it rarely procs, and more often than not, it procced when the mob was almost dead.
Skip it and just stay in Cheetah all the time.
As for weapon speeds, IIRC it doesn't really matter while you're leveling. The reason everyone says "slow weapon" is mostly for Aimed Shot, because if you use a fast weapon, you lose tons of autoshots when you use Aimed Shot. That and, slower weapons use less ammo for the same damage.
Also, you shouldn't be putting any points into MM until you're 31 points in BM. Aimed Shot is nice, but sucks for soloing because 99% of the time, it pulls aggro off your pet. This is what I leveled with, and found it very easy:
Level 20Level 30Level 40Level 50Level 60