Shorter Stem to Compensate Longer Reach Handle Bar?

hi,

I'd just fitted ControlTech Carbon Comp handlebar 80mm reach, which is about 30/25cm Reach increase from my old handle bar....currrently using 100mm Stem....

So would getting a shorter Stem e.g 70mm or 80mm fix the problem...

now i had to move my Saddle forward a bit..to get a better feel