We charge 25%. 

Charge the extra $25 next month.

If you have one that practices real estate law and works with a lot of investors, this should be something he has a form for and won't charge you too much.

To make matters worse, I found out that another savings account that I had stashed money in and didn't check up on, had started charging me an "inactivity" fee of $10 per month. 

@Shakeel Ahmed if you plan to treat it as a legitimate business, invest a few hundred dollars in your own purchase & sale agreement and assignment contract, written by a licensed attorney in Florida.

I am closing on a property today that I purchased in 2010 and then sold on a land contract in 2015, I took it back in 2020 and resold it on another land contract and made and extra 30k while charging 10% interest on the remaining balance. 

I'm not referring to your post.I'm referring to charging the fee.This is not criminal, and not clearly a civil, violation.

I don't mind charging lower rents (as long as the numbers work with my plans), but am I going to be stuck at today's low income rental rates while regular rental prices skyrocket?

Should I expect my PM to handle taking over the service of the electric and water bills and charging that back to me?

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!