Since GMY does special damage, your flat +146 almost doesn't help. You can check it by trying another offense arrow from offense set instead of this one.
Now back to the question, you either make him incredibly fast, or you make him hitting like a rock. In both cases you would want as many +%offense as possible.
So for heavy hitter you would want square, arrow and cross with offense and triangle with cd. Since JKRs lead gives extra cc and offense its not a miracle when those type of GMYs can crit for 100k+, while keeping pretty decent speed because of the same lead and bazillion of assists that add him tm when he attacks a target above 50% hp.
Speedy variation is more like a nasty buff machine, this type of frogs hit softer but more often.
Basically you would want slow heavy hitter under JKR vs other JKR or easier teams, and the fast one vs drevan
