No it's still filling that cup up pretty bad
loosening/re-tightening the bottle sometimes fixes this.
also, if you haven't cut a v-notch in the bottom of the tube it can prevent the catchcup from draining back into the bottle. most people do the v-notch cut to make squonking easier, but it can also help drainage.
lastly, remove the bottle and blow on the 510 to force
juice -- and mebbe some trapped debris-- onto a paper towel.