Cal mag deficiency, overwatering???

This is my second grow. First grow had some lockout problems due to pH but thankfully got it fixed and made it to harvest. Now looks like the start of more problems on this one. Growing in soil 50/50 ocean forest/perlite. Amended with dolomite at 1 cup per cubic foot of soil...mainly because of the pH problems of last grow. I am getting brown spots on the leaves of two plants. Wondering if it could be cal mag def. Or maybe overwatering. But I don't really think overwatering because I did that my first grow and I would like to think I learned my lesson there. Also I have been having bug problems.pretty sure aphids and I have so far sprayed Neem oil. One application 5 days ago and another today. Both during lights out period. Also applied as a soil drench 4 days ago. Not sure if this might have something to do with it. I am using to water and have not yet used cal mag because I thought since I added dolomite that cal mag wouldn't be needed till later on in the grow. Any advice is greatly appreciated. Thanks.

Likely phosphorus excess. Keep going.

If you put 1 cup of dolomite lime to 1 cubic ft of soil there is no way you have a deficiency of either calcium or magnesium. The Ocean Forest already has sufficient amounts of both for plants that size and age.

If anything you have too much calcium in your soil which can cause problems and lockout other nutrients. I've grown in Fox Farms and never had plants that look like that and neither do others. You should have left the cup of dolomite lime out. And you probably didn't have any pH problems on your last grow to begin with either. Did you check the runoff and think that it wasn't what it should be then try and get it to match what you were pouring in?

Soil runoff pH is not accurate. It is not representative with what's going on at the root zone. Leave the pH to hydro growers and just water your plants. The soil already has ingredients to maintain the proper pH range. Although your 50/50 blend of soil/perlite isn't really soil anymore.

You don't need to be adding that much perlite to soil. If you're going to do that then just use straight peat or coco and perlite.

I'm sure you'll make it to the finish line but you're making it much harder on yourself to get there the way you're doing things.

Good luck

As @xtsho said you have 50/50 perlite peat.

Did you overwater using this same mixture?

They look dry as fuck. Never grown like this before but you’d almost need to water smaller amounts more frequently like a semi hydro system…

What light are you using? Sometimes the best solution for chronic overwaterers is to switch to coco(I know this doesn't help you now), then you just mix up a complete nutrient like Jacks a&b and water several times per day (once the roots fill out the pot)-and you don't get these kinds of lockouts. It's hard to say what is going on, but I also suspect the dolomite, but the 50% perlite is also a factor, and it could also be lighting.