This may help you. I overwatered alot on my first grow, everyone probably does lol. I had to learn this the hard way with soil with leaf problems like you have which effect the plant cause its not feeling its best which effects everything, but when they say let the first 2” (up to your first knuckle) get bone dry, they mean bone dry. That is a perfect indicator for when its time to water again. Water just until runoff and then let the first 2” dry ALL the way out. If not you will suffocate your plant and you will vet fungus gnats which will be hundreds. They lay eggs in the top 2” if its constantly moist. They take over and eat up your plant. I have mini fans which I point right at the soil to keep it constantly drying and free of fungus and soon as its COMPLETELY dry, I water again. Hole this helps