What are you finding troublesome about the matchup? I feel like our force balls negate her zoning pretty well and force her to come to us.
It works one round, she just needs to block one forceball and she can do whatever into knockdown. She can react to forceballs with the fullscreen combo starter which will out damage us. She can also do the air blasts which will move her hurtbox above forceballs. We can still block but if you have success in sets by just completely zoning her out you're playing against someones day 1 Cetrion.
Zoning, and who has the advantage in exchanges are about hit advantage. Why does Sub-Zero win zoning wars? cause he gets a combo despite his projectile itself being pretty meh. Boulders are tricky to navigate. Yes if she just spams them in a predictable manner its easy to traverse but then you're not playing zoning right. Zoning is a mind game. If she just waits a few frames by throwing it out it's gonna catch the jump over. If you block a boulder you have to take the next puddle on block, but then she can just throw another boulder, thus resetting the mind game. She will win if she just looks to trade with forceballs. She also low profiles them on crouch block, making her closing in on Johnny a piece of cake granted you somehow get the lifelead.
Kompetitor unfortunately got completely shut down by a Cetrion at Combo Breaker. Any decent Cetrion will win the zoning. Skarlet is also super telegraphed if she just throws out the same shit constantly. When she mixes up slow moving blood balls with her other tools - THATS where it gets difficult, and it's the same for Cetrion