It takes a little bit of finesse to plop the slip down on the slide without trapping so much air. You definitely want a few bubbles because they are very useful to establish your focal plane (of the bubbles are sharp, you will see the parasite ova the sharpest), but I can see your issue with so many. You don't want actual foam.
When I pick the slide up off the tube, I gently swirl it in a couple of circles while upside down, and then place it with one edge down on the slide, touching, before dropping it.
Practice makes perfect!
When I pick the slide up off the tube, I gently swirl it in a couple of circles while upside down, and then place it with one edge down on the slide, touching, before dropping it.
Practice makes perfect!