Any bow set at its Highest poundage and longest draw length is set for optimal preformance.
shortening the draw length (which requires the cams to be changed on Matthews bows) will affect speed more than any thing else If you want 60# draw weightI would suggest getting the lighter poundage bow because when you start cranking down the # on a bow you loose peak preformance and yes you will also loose a couple of FPS that is for any bow.