Dont worry about analog vs ttl modulation too much, its always possible to replace the stock drivers with better ones.
To get proper white, you would need about 3x the power of the green in 445 nm, and also 3x its power in 635, If the red is 650-660, you would need 10 times the power output on the red to match.
Getting that much power of red can prove costly and problematic though, so many projectors work with an overdose of green. This shouldn't be that big a problem within reason, since the viewwers eyes will adapt to some degree. The trade-off is between brightness and color neutrality, but most will sacrifice the latter for a brighter projection to some degree.