Unknown Deficiency symptoms on leaves

Thankfully there are some great picture charts online for each possible leaf condition. I have put a link below so you can use it to help guide any issues that arise . https://www.ilovegrowingmarijuana.com/growing/identify-marijuana-plant-problems/ well worth a look through but also goes into more detail if needed. Cannibalising ( yellowing to crispy) leaves during late flower is not so much an issue as they are tapping into the stored chlorophyll but earlier is , as you correctly stated , a deficiency that can usually be resolved fairly quickly. hope it helps. There are also pages on grow diaries for leaf diagnosis.

Lacking in cal/mag.

Hello my friend, the deficiency that your plant is suffering from is due wrong pH and EC values in the soil. The easiest way to fix this issue is by doing a small flush. Use the pot volume in water with a low EC around 1.0 is enough and a pH value of 6.2 You give the pot volume with this solution. So if you are using a 10 liters pot then you use 10 liters solution to flush. After you have given it then you want to let it drain good before putting them back inside the grow room for about 1 hour. When you finished flushing let the soil dry. You want the top inch from the soil to be completely dry before watering again. Then you can continue feeding like you did but with a stable pH and EC. PH 6.2 and EC 1.5 would be a good way to go in this phase of the grow. Also make sure that you uave runoff every time you water. A glas full is enough just to prevent nutrient salts building up inside your pot. Happy Growing buddy!

How confident your ph is 6.7 and not lower or higher? 6.7 should not be a massive issue in soil based grows. Some of the leaf tips shows signs of overfeeding and other look like its lacking. I wonder if your medium is got a buildup in it and that's the main cause of everything. I'd look into to monitoring the EC of whats going in and whats coming out. It might need a bit of a mini flush it get it back on track. It mostly looks good though so its probably a light problem that could get worse if not treated. Good Luck!

Yes you have more deficiencies ,looks like PH is off , us some cal-mag too ,but PH is important if you lock-out the symptoms will be worse.do not heavy feed autos don’t like that .

interveinal with spots.. could be Mg deficiency. tricky thing about that one is that it starts 30+ days before you see symptoms. So, if you tracked how you fed over time, go back about 30days from the point you first saw the symptoms and look at how much Mg you added over time.. using a little common sense you can either feel more confident about that diagnosis or eliminate it. much easier to do in soiless, hydro. e.g. if ppms are 50 or higher, very unlikely it is a deficiency in Mg. It could still be locked out by pH or another nutrient molecule that is present in too large of concentration. pH would likely cause a other issues before Mg, so i'd assume your pH is fine. Soil usually self-corrects to some extent. refernce Mulder's chart and see what has an antognistic relationship with Mg... if that has been overfed, it is a possible cause too. usually lockout issues are more of a dumpster fire with multiple coinciding symptoms, but not always. Again, doesn't looks to be the case here. More than one thing causes interveinal. Other things can cause spots without interveinal chlorosis (ca, for example) .. so, start eliminating the least likely and draw up a plan for next time. if it works consistent across several grows, you know you got it right.