First off Welcome to the forum.

On to your questions. Heat lights burn off humidity so it will drop as the temp rises. Misting a little more often helps and needs to be done , but too much will water log the substrate. You say you have a Reptifogger hooked to a timer. So just have the fogger timed to turn on every 30 to 45 minutes for 3 to 4 minutes at a time. 15 minutes at full blast will raise the humidity to 100% which you don't want because this will also cause water buildup in the substrate. Investing in a Hygrotherm is a good idea. I use one for both my frogs and it works great.

Pacman frogs are nocturnal and will burrow all day and emerge at night to feed. You should be feeding him at night. They have to have a 12 hour day/night cycle. So like daylight from 8 a.m. to 8 p.m. and night 8 p.m. to 8 a.m. if you're using a heat lamp you need one that has a dimmer switch so you can accurately control the amount of light and heat output of the bulb. 50 watts is fine just don't go any higher.

You should have a UTH (under tank heater) placed on the side of the tank to help with temps so you don't have to dial the light up as high to maintain temps. For babies daytime temps should be 80 to 82 no higher and night time 75 to 79, but try to stay around 77 or 78 at night.

Substrate can be 2 inches deep for a baby.

Don't unbury him/her all the time so he/she will come when ready. If he/she doesn't come out all you should have to do is unbury just the head and he/she should respond to food being in the tank.

Babies should be fed daily and dust his/her food with calcium dust every other feeding and with a multivitamin once a week. Don't dust with both at the same time because they will be less affective.

You have done some research so that's good. I'm glad you learned about your frog before getting him/her.