One thing to consider is that a 17" riser may cost you up to 5# finish weight on a bow as long as 66"(typical charts with 18" standard riser length). In that case you should choose a stack 5# over what the chart says. Same situation if you narrow at the fades by 1/8". Another 5#. Rounding the corners of the glass when finishing can take a lot of weight off too. Most people tend to go a little thicker stack than desired weight because if you are like me I loose weight because everything is rarely perfect when the blank is squared up and ready to profile or I loose weight after tillering. I just about always end up a little more narrow than the glass width was before layup and also have to tinker with tiller and loose weight there too. Wiggle room.
Another thing, and I am assuming here, if you used the 3R chart and bought their tapers you have a total stack taper of .004 per inch not, .001 total stack taper. If not then disregard. Higher total stack taper can take weight too.