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Y math? Use this: http://yojimg.net/bike/web_tools/stem.php
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Dropping a couple of spacer make very little difference.
You'd know if you find riding on the hood feel a tad stretched.
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What's your definition if not long runs?
It could be that you are able to cope with what is basically bad positioning for an hour, but if you go for a long ride it will fuck you up.
I can ride my polo bike for about an hour on the road with no problems. An hour and fifteen minutes and either the top or bottom of my back starts to ache and tense up.
amey
edscoble
Khornight2
@fizzy.bleach
Saddle-bar drop question.
I had a fit about 18 months ago and got a fairly small drop of 34mm, possibly because I'm tall, (was) pretty inflexible and asked the fitter to fit me for an "audax" position. Since then I've gradually removed 2 spacers to drop this down with no noticeable effect, but I've not taken that bike out for long runs. In that time I'm sure my flexibility has improved, due to running-related hip exercises.
TLDR: if I drop the bars (by removing spacers or lowering a quill stem) to accommodate more flexibility in my back/bum/hips/hamstrings, will I need to think about adjusting other stuff as well like reach? Maths says that lowering stem pushes bars slightly forwards...