I just changed the limbs on my '04 B/T Mighty Mite from 70 lb to 60 lb max. I was shooting at 64 lbs DW prior to the limb change. I am presently using my oldarrows which are GT XT 55/75 at 27" (4" feathers) and 100g tips. I am looking for advice to determine if I need to change arrow spine. I am going to buy a dozen new arrows --- just want to make sure I buy the correct ones. I have narrowed my arrow choice down to GT XT or Easton ACC. I shoot a release with string loop, and a MZE rest. Do I need to decrease my spine? It appears as though my bow shoots fine --- but I can't help but wonder if I'm spined too heavy. Any advice is appreciated.