I too have a G36 and carried it for a year before retiring it to woods defense. If I had to tuck my shirt in, I wore a Galco Underwraps Belly Band. If I had an untucked shirt, I wore my Double Tap A.T.S. I also had a Comp-Tac MTAC, which might suit you better with the movement that you're describing. I sold the MTAC to a buddy with the Kydex shell for a Kahr CW9 so I still have the kydex shell if you decide to go that route. PM me if you're interested.
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