Originally Posted by linberl

Imo a bike should fit. If it doesn't you replace the offending part. Too high can cause problems just like too low can. Depends on how your body handles the different stresses. Too low will also reduce your power. Why did the fitter want your seat lower? Are you having any issues with it the way it is? Go buy a cheap seat post and cut it to the shorter length and try it. Once you get it dialed in, then you can feel confident adjusting your carbon post.