Round 2, Grow! Hindu Kush auto (freebie)

Week 5 (12/8-12/14) Day 31 (12/9) Fed her today. Bumped her up to about 75% strength (50% last go around), in half a gallon of RO water, then pH'd 6.5 . Day 33 (12/11) I got rid of some of her yellowed leaves. Other than that, just trying to keep the canopy even and letting her do her thing. Day 35 (12/13) I'm starting to worry about some spotting on her leaves. When she sprouted, her first two leaves had light tan spots, I thought it was just a thing. Now some of the big old fan leaves have the spots and they are seeming to grow. Looking online, it seems like a pH fluctuation issue. My only thought is that maybe I went too heavy on the dolomite lime when mixing up the soil to pot. Maybe when I give her nutes, it brings down the pH but the lime brings it back up, causing the fluctuation? Honestly, I have no idea. I was going to water her today (day 4 since last one), but her pot is still pretty heavy and I worry about overwatering. That and she is pretty small compared to my last plant, my only other grow, so she is probably not taking in nearly as much. I know it's a crapshoot, but I will try and test the runoff pH when I do water her. I'll water like normal, let her sit an hour or so, then give a little more and collect the runoff to test. Day 36 (12/14) I did the runoff pH test today. I know it's not really reliable but I gave it a try and followed a guide I found autoflower.net. I gave her RO water pH'd at 7 and gave her about 1/2 a gallon. I waited an hour until there was just a little runoff. I then placed a bowl under the pot and added another 1/8 gallon of water. I collected the runoff and tested it with the drops I have (no meter) and it came out the same as it went in. So idk. She's doing okay and the spots are really getting any worse so...