I have found that the steadiest support when shooting from sticks is to try to have a second set or even a single one with a "Y" shaped top or yoke that you can place under the butt, near your shoulder. Makes a big difference, but takes a bit of time to setup two sets of sticks. The new tripods from Stoney Point are far better than sticks - they weigh about the same but stand by themselves. Maybe try adding a third leg to see the difference. You can take your left hand off the sticks if you want to.
