What's the best way to fill small voids in glue lines along the edge of limbs?
Blow out the hole with air pressure and mix up a little glue like ya used on the glue up and use a tooth pick to fill the holes.
You may also want to add some type of filler (sawdust) to the glue to help cosmetically and strength. Unfortunately if the gap is big enough to need or want to use a filler, chances are also pretty good that this may become a failure point. Watch this area very closely as you tiller and shoot the bow accordingly.
Lamination raisin and other epoxy glues can be heated (carefully!!!) and applied on the gaps.
Bend bow a little to widen cracks and release after no more glue gets inbetween.