Tip shadows

[Bianchi]

OK, this is probably a stupid question, but here goes:

Ever since TCSS started using the non-metallic reflective disc, sabers have not shown the "tip shadow"/dark spot phenomenon (point a lit saber to a wall while close to it and you'll know what I'm talking about).

The problem: even with these new non-aluminum mirrors, I'm still getting tip shadows.

Only one of my sabers (a green Lux III) doesn't cast a tip shadow.

Any advice on this? If I'm doing anything wrong, please, tell me.

Thanks again.