This might be an awkward suggestion, but get used to getting the seal when you're not on your period. Pardon the language and imagery to follow, but I can't think of any other way to describe it: using it when you have a fair amount of discharge, but aren't on your period, let's you move it around and poke at it more than if you're dealing with blood, etc. The first many times it took me quite a while to get it open and seated- like 5 min type long time. You need to try this when you have time and no fear of someone walking in or anything. It gets easier as you get used to it. It works great for me now, i just have to check a few times per day to make sure the stem is still lower down- if it's up too high it doesn't seal correctly. The stem is low enough that I can just feel something if I sit oddly or move in a strange way. Some women cut off the stem for this reason. I think putting it too high is one of the biggest problems people have.
My two cents, hope it helps someone. You have to be really, really comfortable with your body to use this. Lots of poking and prodding and running fingers around to check the fit until you learn how to use it.