I felt the same way with my 3000 doubles. I ordered a replacement spring from Gibraltar off of Amazon and it made no difference. It helped at full tension as it is a brand new and a tiny bit shorter spring but nothing to write home about. I personally just found a more comfortable and less work needed from my leg/foot spring tension, as I was at full tension for many months but because of the stock beater it's still quite slugish. It's like a lose lose situation until I can get new light weight or smaller beaters on this set to see if it helps. I know for a fact these pedals are slugish, if you watch a Tony Royster video of him playing a DW Performance set on a promotional video, you will see him play the 9000 with the same beater but the pedal and beater move effortlessly. It's insane and makes me crave for a pedal like that lol!
I have to say for what these pedals are, while being a tiny bit over priced IMO, they are quite nice. Solid, no noise and I've been able to advance my skills with my double bass playing with them. Also, with the weight of this pedal in general (the pedal and beater) it has helped with my leg strength and memory. So it's a good pedal to work with for a while until you can afford the good ****, then I hope to feel my feet fly once I do get something better.
Nice name BTW, friggin love Gospel Chops and hope to learn those skills some day!