For lvl 57 autoduel deck, use the fusion deck as it can reach up to 4k assessment. It needs a Balance skill for this deck to work and has 95% winrate. :)
The issue with fusion auto duel decks is that the AI wont use a fusion summon first turn and may drop a material monster on the field for a chump block instead.
i was using almost same deck, heart of the underdog would be nice add, since u want to run fast on your deck, i got another copy of meteor b dragon (f2p as well), and replace the kangaroos with another summon skull, and third red eyes, more consistent.