That your ejection fraction ratio jumped significantly after new ablation resulting in reduced resting HR seems to indicate that the high resting HR was actually decreasing heart function. That sticks out to me. That it never went over 100 bpm your original EP got stuck with that line in the sand of 100 bpm instead of investigating further the and listening to the patient.

This reminds of a time I had been moved out of the ER into the cardiac unit. They had got my resting HR down to 60 with drugs but I didn't feel comfortable. I got into an argument with a cardiac nurse who kept saying "I see you are in sinus on the monitor. I've been in this unit for 25 years and know what I am talking about." I kept saying it doesn't feel right. The doc was standing there and was quiet. I told the nurse that my resting HR is in the lower 50s to hight 40s. I repeated to her that every time I convert to sinus my HR will drop into the 50s. This argument went on for a good 5 minutes and then just like that it dropped to 54 . The doctor looked at my monitor and said " it looks like you are in sinus". Nurse ratchet had to eat her words.