Welcome Linda!
Uhm, may not be your imagination. Although, I run about 1.8Ω coils, but 50/50 juice, and I don't have any issues. I do build my own coils - and I've gone as low as 1.4-1.5 without problems. What kind of topper are you using? Maybe the airflow is getting choked. You're not over-tightening the topper? Flavors of juice?