Sorry Pez, Its not a matter of simply remixing the ratio of blue vs red.
As a single light source, the more of blue or red, just makes it more blue or red and not purple, as you mentioned.
It still comes out pink, bluish, or impossibly dark, and inserts may be white, as well as pinkish....that people want purple.
More recently games like IM have a rich purple insert, and the effect is seen less here, so this does support and agree with your contention.
The solution was a purple cap with a brighter diode.
Another solution were 3 diodes +, mixing individual colors, but twice the price....and we all know no one wants to pay more.
It took 9 months, around 60 iterations of powder trial and error and 8 tries on the lens to get right.
Cost me more to do, then a Premium GB, so its around a 7-9 year payback.
Not exactly a good business financial decision, but I wanted it, everyone wanted it, and a positive product was the result.
I kept it priced only pennies more then regular...... 
