Feeder size and Tank size

Hey guys,
I just want to double check I'm doing things right. I'm feeding my 512g F Ghost 39-40g rats atm, she is just barely a year old. This a good size still, or does she need bigger? She eats once a week consistently but won't strike, just eats it after I leave it in her tank (because I can't feel my arm after standing with the rat for 20min....... -_-).
Also, she is in a 20gal long tank, is that good for her or no?
Thanks a lot!
Bonus pic of Olympia. :)
http://ball-pythons.net/gallery/file...805_193108.jpg

The feeder and enclosure size seem fine to me Rep. You could offer a slightly larger meal or a second prey item from time to time if you wish but it's not necessary.

Thanks a lot! She's going into shed now, first time with me. :)