I'm not a Glock armorer and I don't have a 43x, but when I've had wobbly front sights (Ameriglos), it was my fault not the sights. I just hadn't completely seated the sight straight in order to get the screw tight enough. Also, Loctite (Blue) is critical, otherwise the screw just backs out with vibes and heat.

I understand the design reasons why, but there's just so little room for the wrench to get a good purchase on the head of that screw that it can be hard to grab.