And the spin-and-back-cover slot shot. I don't know why you'd ever spin into a slot shot, but then again, I don't know why you'd jump into a scorpion, which I assume is the shield-side, over-the-top wrap shot "Scorpion."
As a shorter fighter, work the same-side hip to keep the shield honest, then go high.
I don't know what a ground-tap leg shot is, but if you're hitting the ground and then swinging at your opponent, stop it. That only works on bad fighters that you don't need silly tricks to beat, anyway.
Unless your shield has a lot of length, you'll want to avoid getting belly-to-belly with a sword/stick user; once their shield is in your armpit, you're never going to get sufficient force with a flail, and you can't stab.
The shoulder pop is a "meh"; it's hard to make it hit sufficiently. You've really got to swing to make it count with a flail because you don't get the concussion you would with a sword or bat. Now that you're swinging, you're not "popping" so much as "hammering." The shoulder pop is very much a "tagging" shot, in that it touches your opponent without really making a point, but the opponent takes it because he or she is embarrassed that he or she got hit by it. Where I'm at, we call light on light shots, so people don't throw that garbage.