Anyone have tips for keeping the domes on? If it is hard to get any suction does it mean the domes are too wide? I fill up the small cups now but still have trouble sometimes keeping them on. I can't get the larges to stay on for more than a second at all and assumed it was because they were way too big. I'm waiting for the mediums to arrive and after fiddling with the smalls more and not getting any better at keeping the suction up, I'm afraid the mediums will be too big across too.

I see so many people who say they use larges and XL and XXL and I think there is absolutely no way I'll ever get the larges on even one at a time. But maybe I'm not doing it right

I'm petite but lots of other people sound like they are petite too.