I had an ablation in 2014 my heart it was 150-170 what up at resting are sleeping now my heart rate goes to 130 to 140 I'm on medicine my sometimes ablation works sometimes it doesn't. It doesn't sound like your ablation is that bad at 60 or 90 that is normal heart rate tachycardia is 100 and over a hundred beats and or more. Hope it gets better you can ask your EP doctor to put you on medicine if you don't think it's working ❤️❤️😁😁