Pumping just seems to fatten the tissue around my dick instead of giving me length; what am I doing wrong?

I'm using the NYTC Transmasc pump delux. Worth mentioning, I'm moderately fat. Somewhere in the low 30s for BF%. I have a lot of tissue down there. Still, I've been using the smallest cylinder in the kit, and I meticulously move tissue out of the way to get the flange as flat on my pubic bone as I can manage. I use lube on the flange, just inside the rim, and a bit on the tip of my dick as I've seen recommended. One full pump pulls enough tissue in that I'm just about at the top of the cylinder and it starts to pinch a bit, so I haven't gone past that.

When I'm done with my 12 minutes or so, and I take everything off, I look like a freaking Staples easy button (shape wise).

That's really not what I'm going for. Is there anything that I can do about it? Any help appreciated.