Why'd you drop your Ami post? Real classy kid.
Tens aren't that hard if you go at 'em slowly for a few months. Even 11s and 12s at E don't pose too much difficulty. Within a couple years you wont even notice the extra effort. The diminishing returns are of course it gets progressively harder to bend quickly, and worse, bend high enough and of course fatigue. With 12s you might get a comfortable whole step at sane tempi. Your risk of injury goes up with gauge but by your demo clip, if you stick to that kind of methodical work, even Jazz gauges should fall right into your hands.