Help With Leaf Discoloration

Hey guys, bout to be going into week 7 of flower and noticed some leaf issues starting to pop up over the last few days. Probably too late to do much to these plants, and the buds are still looking good, I just wanted some help figuring out what my plants need more or less so I dont have any issues pop up next grow. The only nutrients Im using right now is 5 grams per gallon of Mega Crop with conditioned, ph balanced water, every other watering. Growing in soil. FFOF. Repotted a week or 2 prior to flower. All leaves affected are at the top of the plant. If any other info is needed for better assistance please ask. I think I have a decent idea of what deficiencies it might be, I just wanted a 2nd opinion as so many deficiencies look so similar to each other and nute burn and light stress and such. Any help, tips or suggestions would be greatly appreciated.

hello
so just so out is hard to tell 100% but there is a very simple test 4o do with no downside .
one , plants need all 12 minimally required nutrients at all times .there is never a time when a plant will want just one over another. N P K Ca Mg S Fe Mn B Z Cu Mo
so my test is to water the pots until solution comes out the bottom .
test the runoff ec .if the runoff ec is more than 2x the input ( 800 ec input feed 1600 out ) they are suffering from nutrient lockup. the necrosis ( brown dead tissue is the first sign .) the plant will display deficiencies of random minerals. in this case it's a mobile nutrient as it starts at the top .most likely one of the Trace minerals
but the reason will be high ec .
flush the medium with 1/2 strength feed solution until the EC goes down. continue watering normally with complete solution each watering with a 15% over flow each time 5o control the medium EC and you can check the runoff each time .
if it is not this a plant got an extra watering and 5ou used a bit extra solution.