I picked up some shooting sticks last year to help my kids. Well, uhhh, maybe they are good for Dad as well.
I get most solid if I can get an extra point of support...in other words either get my back against a tree/post or get one leg of the shooting sticks against something. If you can lock all those points of contact and support together, it is excellent. In one of our shooting stands, our set up is to get a boot behind each foot of the sticks and lean the top against the side of the blind. That's solid, and we can adjust elevation with our feet, sliding forward or back a little.
They are also surprisingly steady if you grasp the forend of the rifle against one leg of the sticks.
Experiment.