As silly as it may sound, spending about 6 hours playing solo really helped my multiboxing game already. I now feel much more comfortable playing my fury warrior. While I am not playing to 100% of the potential of a solo player, I know I'm doing significantly more than I was before. In the end, I still ended up with cast sequences, but they were ones that I crafted. More importantly, I understand why I crafted them and can change them in the future (as opposed to just doing a google search for the best).