i did not even consider the esc amp. i bought some of the 45c battery's. but my battery's have sat for a few months so i may have to buy some new ones. so that explains why most are using the 20amp esc especially since they are so small now.
then you do not have to worry about your rating as much on a mini.
Remember the rating on an ESC isn't how much it will pull from a pack. It's how much it can reliably pull without burning itself up.
The ESC doesn't limit anything. You can pull 25 amps on a 12amp ESC...but you'll burn up the ESC doing it unless that ESC is really really underrated
Just like putting a 30amp ESC on your build doesn't mean you'll be giving your motors 30A. Just means the ESC can deliver up to 30amp continuously and reliably.
The power draw is determined by your motors/props. Put on bigger props and you'll see a higher amp draw.
Putting on too small of an ESC will generally just burn up ESC's it won't limit the power delivered to your motors. Putting on a larger than necessary ESC will hurt efficiency since they're bigger and heavier and don't give you any benefit.
And FWIW ESC ratings a pretty hit or miss. I've had a red brick 25amp ESC let out the magic smoke at less than 20amp of continuous draw. And I've had some cheapie 20amp ESC's do well over 20amp for sustained periods. Just depends on the manufacturer and how honest they are.
That's one of the big reasons people were blowing up 18amp KISS ESC's. When Felix rated them at 18amp he meant 18amp - that was the LIMIT for what they could handle and why he called them 18 amp and not 20amp. But a lot of people are used to ESC ratings being wishy washy and under reported so they pushed them past 18amp and were upset that they were burning up. It's not that the 18amp KISS were underperforming, it's just that they were only performing to their rating and people expected them to have more overhead above and beyond that rating.