Your burden becomes a factor in your predicted longevity when it exceeds 1%. Recent studies show that there is a marked increase in all-cause mortality attributable to PACs when their number exceeds 76 in any 24 hour period. You're well above that.

Note that a great many people live with 200-400 PACs every day and they just get used to it. Some cannot...no way...no how. This is where you ask your cardiologist how much stock she places in your symptomology and its impact on your sense of well-being. What does SHE think or take as a burden beyond which intervention should be undertaken? Make it clear that what you are experiencing is deeply unsettling, and that you'd like his/her help to reduce the numbers, including to zero, and including an ablation.