You may need to remove /ac “Areo” if you don’t have it, but this is what I’m using. Pointers given to me by my guild leader Club.
/echo .
/ac "Bio"
/wait 2.5
/echo ..
/ac "Aero"
/wait 2.5
echo ...
/ac "Miasma"
/wait 2.5
echo ....
/ac "Ruin"
/wait 2.5
/echo ===[Arcanist Attack Complete]===
You can run while casting Bio & Aero
/echo .
/ac "Bio"
/wait 2.5
/echo ..
/ac "Aero"
/wait 2.5
/echo ===[Arcanist Running Attack Complete]===