How to counter Greek crossbowmen / hoplite / ballista spam combo

the tactic I'm using: any fast moving you can use will be fine as long as you separate them in groups. the main word here is "divide": drag the hoplites as far as you can so you are out of reach of the gastros, attack the ballistas the same way with another group so they dont pound you while your dealing with infantery and possibly use a full line of preists with a very long range to convert the gastros as fast as you can... all of your units should have heavy armor and maximum damage