if it was me, I would put follow on a separate button - used ` when I used Keyclone and now the default ctrl-alt-F in IS. Can someone check if you can put /castsequence after a /cast autoshot? If not add it to the castsequence instead:

/assist priestname (or focus)
/cast autoshot
/pet attack
/use 13
/use 14
/castsequence reset=target/6 arcane shot, spell2, spell3 etc...