I guess I'm not too high-tech
Man you guys are doing alot better than this old man. My range is in my back woods and all I have for a rest to test loads is a folding chair and the ground. I just plop my backside in the dirt. Nestle myself behind my weapon. Rest it in my offhand on top of a folded up guncase and fire away. But at lest I have fun;-)
I hope you find a solution to getting your rest firmed up and you on target better. There's nothing more frustrating than not being on target like you want.
Wade