Well, before you go spending more money let us know what you are shooting now. I only assume you are now shooting some sort of over draw. Point being that with the bow set for 27" you should be able to eliminate the overdraw and shoot the same arrows with a rest mounted right on the bow. And it really doesn't matter if the arrows are a bit long anyway. The shorter your arrows get the less accurate they tend to be.

I have shot 27-27.5" and up to 60lb-65lbs for quite a few years using arrows with about .500 deflection. That means a Beman or Easton ICS 500. In a Korean Express that means a 200 (they haven't figured out how to mark them right). Or just about any of the cheaper arrows marked 45-60. Most arrows rated like this (45-60) are done so considering an average draw of 29".. Shooting at the length they are right at the top edge of the spine range at 60lbs. Shooting a bit shorter they tend to be more toward the middle of the range.

Different weight points can change dynamic spine also, as can shooting vanes vs. feathers. Vanes change the dynamic spine to the stiff side. Lighter points do the same.