Since you've already bought the ticket, just go ahead with it. There's always a risk whatever airline we choose. What you can do now is put your trust in the hands of the pilots and be prepared. It's not worth thinking that you'll get involved in the third incident because when it's your time, there's no way escaping it.
I hope you enjoy your boracay holiday though. It's not the best time to be there as the wind is already blowing westerly.
When your experience with Zest proves to be an unpleasant one, then don't fly with them the next time. Good luck!!!