Concern about discolored leaves - thoughts?

[Rwise]

I am watching for the fade in 2 of my girls now, time to start reading the trics!
Not being sarcastic at all. It is also different inside compared to outside, I have seen it called LED light fade and cal/mag recommended.

 

[Sperocles]

Here are some photos from my 2nd grow - Wedding Gelato, soil, FoxFarms nutes, 2x4, SF2000. I just increased light intensity to 100% from 75% with about one month left before harvest (I'm at day 78). Only one of my three plants has this degree of discoloration. Dark, mottled leaves up top and yellowing leaves near bottom. I added some Cal/Mag to the feeding for this plant this morning. The other two plants show some signs of similar discoloration but nowhere near as noticeable. This is a little different than the discoloring I had with the first grow above and that didn't seem to have any effect on bud quality as far as I can tell. So, question is does anyone think I should be concerned about this and would be wise to take some kind of corrective measure?