1. How many calories should I be eating?
Calorie Needs for Barbell Training | Robert Santana
2. Should I be adding body weight at this point? (think I'm around 20-25% body fat on the lower end of that spectrum)
If you are having trouble adding weight to the bar then yes but slower than you were before.
3. How do I get my deadlift where its supposed to be?
You use chalk even if it says no chalk. Get liquid chalk and be keep a low profile. You should be pulling 405 x 5 with a squat like that. This is leaving lots of upper body muscle mass on the table.
4 . I get really light headedness from the press like I'm going to faint. Why and how do I fix it.
What time are you training? I used to get this bad to the point where I would faint on limit sets. I found that training in the am was an issue because I had less carbohydrates and thus was less hydrated, leading to my BP bottoming out from extended valsalva. In the afternoon i'm more hydrated, fuller, and have less of an issue.
5. I've neglected power cleaning because I feel there is a lot of technique. Is power cleaning super valuable to someone who isnt an athlete? Are they 100% necessary.
At your age yes.
6. Sorry if this isnt the correct forum/ thread
Since you asked question 1 i'll let it slide. That and I hate artificially weak deadlifts.