Checker springs are just what it sounds like, a lighter spring so you can test the motion and get the pattern.

And if you can determine IF the geometry is off, how would you propose to "fix it"? If this is really a "stock" build, you aren't using really high load springs, maybe they are single springs also? It's good that you checked it and if the pattern is in the middle even better, but once you get the pattern where you want it using the adjustable length pushrod, do you have the tooling to measure it (the pushrod)? And I do not mean a tape measure.

Again, this can be a hotly debated topic. I would highly doubt your rocker geometry is that far off to wear out the guides. Again, jmho - it's good that you checked it and if it's close to what you want, it's all good!