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You might try adjusting it for a maximum cant.

I had a similar problem with my comp-tech which is very similar in construction to the super tuck in that the cant is adjustable. It came out of the box with a middle of the road cant. I wore it that way but the pistol butt stuck out a tad and held my shirt away from my back. The effect was even more pronounced if I bent over at all. No one noticed, not even my wife. But I felt it and it made me self conscious.

I tried adjusting for no cant. The pistol rode very deep, against my belt, was hard to grab hold of it without grabbing some shirt too, and although the tent-pole effect was less, it was still there.

So, I went the other way, with maximum cant and it worked great. It holds the butt flat against my back. No tent-pole effect from the pistol butt being angled out from my back. My shirt hangs straight and even when I bend over, there is no bulge other than the thickness of the pistol, which really is unnoticeable.