It's all good...

If I'm using the calculator correctly it seems that I could get rid of almost all my spacers and increase the stem reach by going with a 100mm @ 17.0°:


Stem Angle: 20.0° 37.0°
Difference: 17.0°
Stem Height: 59.0 mm 59.6 mm
Difference: +0.6 mm
Stem Reach: 74.3 mm 76.4 mm
Difference:+2.1 mm (-6mm = -4mmof effective reach)
Spacers: 30mm 10mm


But....by going with those handlebars I'm losing 6mm of reach at the bends...The Zipps have 70mm reach my current bars have 76mm...So, I'd actually lose 4mm of effective reach using a 100mm stem.

If I bump the stem up to 110mm @ 17.0° I get this:


Stem Angle: 20.0° 37.0°
Difference: 17.0°
Stem Height: 59.0 mm 75.6 mm
Difference: +16.6 mm
Stem Reach: 74.3 mm 84.4 mm
Difference:+10.1 mm (-6mm = +4mm of effective reach...)
Spacers: 30mm 10mm


and I'd gain 4mm reach...


I'm going to call Zipp...Ha!