Tapered or not has no effect either on CV joint angle or tie road angle. Those are affected by increased down travel only.

Taper only affects upper ball joint binding angle but I don't believe any had problem with that.

Ball joint flip is same has same affect as spacer less thickness of the spacer.

Now the part that concerns me the most is that taper. Taper implies that original mounting surface of upper ball joint (top of A-arm) are no longer parallel to ball joint mounting flange. That means that you are bolting together non-parallel surfaces which is big no-no because it creates bending momentum on bolt. They are not designed for that. Bolts are designed to work against tension or/and shear not bending.

Hypothetically you could remedy that with another tapered ring underneath ball-joint but whole point of having taper is questionable IMHO.

I'm really not into product bashing but tinkering with suspension is very serious matter. Yes it worked on your truck but none can guarantee that it's not because of luck or just the fact that you didn't subject it to enough stress.

When you do mod to your own truck it's one thin once you start selling those to open public it's whole different matter. In our litigation happy society you always need to think of the worst.