How do you know if the reach is too short or long

[LoriO]

Sorry for the delay in answering, I work mids and just woke up.

My bike has straight bars (Giant FCR 3 W). I am trying to keep the front of my palm at the bar but seem to keep ending up resting on the heel of my hand which is why I wondering if the reach is too short. The left arm is fine, no pain or discomort but the right arm gets really bad. It may just be a bad side effect of all the old nerve damage and cubital/carpal tunnel issues and something I may just have to get used to dealing with. The back and shoulders feel fine.

There is no comparision between my old bike and this one. My old bike was very upright compared to this one so i am in a more inclined position with the new bike. Other then where my hands are I love my bike and the fit. I feel very balanced (unlike my old bike).

I am planning on taking the bike in shortly for it's 100 mile adjustment and plan to ask the LBS about it too but wanted to see what you more experienced bikers thought.