Hi,
Now, I am not slamming MG, but I have heard and seen this very similar problem with it. But, I have seen this is two scenario's. The first, with new cuttings, it burns and cause's plants look go under stress. This is bad especially if your clones had some of the larger leaves cut back to slow photosynthesis down during cloning; and than when planted in MG those cut's became crisp and damaged. And the second is during week three onward in flower. The quality of NPK is not quality and P being very hard to intake might be difficult for your ladies to work with in partnership with MG. The idea of MG was for outdoor use. Not indoor. Its a little hot for my liking. I like to introduce a very light feed for my cuttings when transplanted and than a good vitamax feed during it's watering, than to a regular feed (mild) before it gets to a normal veg feed.
How long can you get away with MG not having to add a liquid feed? If I had to put some twentys down I would guess all veg; veg being 21-28days. Hey, but MG seems to work for you so far, maybe just need to supplement with it now. General Hydroponics is fairly cheap and works fine. Has a nice three part or two part programs too.
BTW good job on your grow!
Growone, I agree with yea their, Keep your hope, and I would maybe add some new soil but keep the container size very close to the size you are using now!