Joye 510 atty users should note this from the datasheet:
At 5V you've pretty much hit that. Joye users should probably stay a hair below 5V. Carto and Clone users (actually any atty > 2.8Ω) should be good to go for 5.5V.
The D-Sharp D-Light.
Very nice and feature packed. All it needs now is the proverbial kitchen sink.