I've found that too much Cents give my beer an unpleasant candy-like sweetness, so I've started to shy away from them. Maybe I just need to crank up the sulfates with some water treatment.
Really? Maybe it is your source? Mine are always bright, clean and citrusy. I do like to blend them with columbus at the very least because they can be a little one dimensional on their own.
Mine are all homegrown. I plan to tweak my water profile first, and if I'm still unhappy I'll buy some commercial cents and brew a batch. I've had good yields with centennial and excellent aroma. They're also notorious for sending out lots of vigorous shoots far away from the main crown - they're always trying to take over my hopyard!