Need advise from you experienced shooters...

Front and rear support is the most stable for sure. The idea is to let the front rest and rear bag do most of the work. Grip the gun lightly with your trigger hand so as to not disturb your aim. I squeeze and manipulate the rear bag with the other hand. A steady table helps a lot to. That and lots of practice and try to be as consistent as possible shot to shot. Good luck! 
 
30 Cal

I see what I am doing wrong then....
My shooting table is only clamped to my deck railing (2x6) and is only 1/2 plywood and wobbly... very wobbly bad plastic cheap c clamps

I mainly use the one bag under the forearm....
I have many shooting stands that support both areas... but never liked them...
I like the Caldwell bags the most..and have many

I will fix all my issues and let you know....