It is the nature of this led. The turbo tint is not different from the significantly lower top ramp setting tint. To be more precise, the purple-ish is in the spill and not in the hotspot.
Depends on the colour of the coating, the tint can go anywhere. The green coating of my D80V2 actually works as a minus-green filter, a purple coating removes some red and bluecand so effectively makes the tint a bit greener. I have not seen red or orange coatings (apart from non-functional coatings on very cheap chinese binoculars), those would make a tint cooler.
I think it’s more to do with the reflector shape and focus than the led type. You can try adding a paper spacer under the centering ring to change the focus slightly.
I dont know if this is a common thing with the FT03 mini 50.2.