I've just got a new (used) frame with a Fox DHX 3.0 shock. The spring that is on the shock is too heavy for my weight so I'm going to replace it. My question is; does the new new spring need to be an exact match as far as shock stroke is concerned (2.55) or do I have a margin that I can work with? I've found a couple of springs on eBay at the suitable weight, but they are for a 2.80 stroke. Some clarity on this would be greatly appreciated.