I often use beads and find that they are anchored better if I put them on as I go along. I load the bead on the 1st half of the stitch (going left) and then anchor it on the finishing pass (going right.) If I'm using at least two threads I split them around the bead to anchor it, or if I'm only using one thread, I pass it back through the bead - both will methods will take out the "wiggle" and I feel like the bead is less likely to be displaced. All that being said, I sometimes have to use hoops big enough to encompass the entire design, say 16" -18" quilting hoops, so the beads don't get crushed. Usually, though, you can strategically place a normal sized hoop to avoid the problem. The whole project is lovely. Your stitching is beautiful.