and you just painted the outside? nice! I'm going to the craft store today to get some glass balls, but i heard that they have thin glue that you swirl around the inside and the put the glitter inside, so it doesnt fall off.
I agree w/ SophisticatedHippie. You may not be using them correctly. Jump rings are a pertinent part of jewelry design, unfortunately for you, I guess. Just practice with them. Also, if you are buying crappy ones, that might affect the ease of using them as well.