That's a touchy issue - but might not be a bad suggestion in the circumstances. I definitely wouldn't recommend removing leaves - as a rule - but every situation is different. This situation has a pm issue due to poor ventilation/air exchange/rh level issue/whatever you want to call it - that's what causes pm. The idea that it's systemic, so the plant is to blame, is wrong. It's environmental - in the same way that you catch the flu - once you've caught it it becomes systemic, it's in your system, that's all systemic means; but it originated outside your system and got into in by some means or other.your plants look great man but i'd suggest you pluck a few fan leaves off too, like i said, you need good air-flow and your plants are very dense, ...are you growing them under MH by any chance?
anyway, they really do look good man, nice and vigorous.
peace, bozo
btw, you'll find a lot of haters who absolute are against plucking fans from your plants and rather than listen to the arguments i thought i'd post up a link you may find helpful in your decision making process.
...the purpose here is to increase yield but it is still well worth the read and in your case very much applicable.
Defoliation: Hi-Yield Technique
peace, bozo
Removing some fan leaves as you go along is a consideration