squeaky poly bushings driving me nuts, ideas?

Is adding grease fittings a good plan ? What about the front eye bushings.. Drill a tiny hole through the spring for a grease fitting ?
I asked because I have Energy Suspension black urathane bushing still in the box and need to decide , use them or toss them.

http://www.firmfeel.com/lcapins_a.htm
This is what you use.