Try practicing in the healer Proving Grounds. That's a great test of your mana efficiency. If you don't stay on top of things, you get off balance and have to resort to Regrowth and Wild Growth. PG is a good way to practice watching for when damage appears, so you can handle things with poise and not panic.
134 is insanely low for spirit alone. I assume you are just quoting the spirit from gear, and not the total spirit including base spirit. My gear spirit is 230. Look for trinkets, rings, cape, and neck pieces with spirit on them.
