'Still better', 'Better still' & 'Better yet'

source: Learn English with Let's Talk 2013年12月16日
Test : http://www.learnex.in/difference-betw...
# still better: used when something was better before and continues to be better.
--John is not as good as he used to be in playing chess, but still better than William.
--The pasta is dry, but it's still better than the one we had at the party last night.
# better still: used when someone makes a good suggestion, but you have an even better one
--You can send them your resume or better still, try contacting the manager directly.
# better yet:  used to offer a better suggestion to replace a bad idea
--If I am late I will call you and inform, better yet why don't you take responsibility and leave earlier next time.