If the new targets have a harder composition you have to increase spin. I've seen numerous shooters pull out from registered shoots because only dead-on hits would break the targets. Go back to the old target brand. Or, increase target spin, install new rubber on trap throw arm, contact target mfg. and get the composition checked. Conduct an introductory trapshooting scheme or competition.
Schools are always interested in competitive events students can participate in.
Talk to the sports coach first about these opportunities. Contact local merchants to sponsor competitive and informal events to donate prizes and added money. You will be surprised just how many merchants will participate when you give them the opportunity and also give them an advertising plug in your newsletter. Every city has a writer's club. Contact these writers and invite them to your club and ask if they will be willing to write a magazine article about trapshooting.