Try nappy pants instead maybe? Asda or Tesco are pretty good
Asda Nappies
Whatever nappies you decide you use get some OSFM cloth diaper covers and put those over the top they will catch any poop that leaks from the nappy. We never had a blowout in cloth, they have real elastics. Reusable Swim diapers can be used as a cover as well
I really like Asdas nappies. They fit my chuncky legged girl really well and we rarely have a leak any more!