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I've learned that calling squirrels is pretty much useless, you're better off just sitting still and being quiet.

Akula,

Here's a little trick an old timer showed me. Squirrels are like cats, incredibly curious but cautious too.
Often they'll come in close while your sitting still, but somehow will detect you and move around to the opposite side of the tree. They'll do it after a miss with .22 as well.

Take a shotgun shell, 20-12 gauge works the best. You want one loaded with bird-shot. Open the end and take out the wadding ,leaving only the BB's.  Close up the end, securing with duct tape/wax.

After a miss, or when they go to the other side of tree, you shake the shell gently, just enough so they can hear the rattle. They will more often than not, throw caution to the wind and stick their heads around to see what's making that weird sound.

Not sure how you would manage that with a bow and judo tip?
If you can figure out something, it will increase your odds dramatically  8-)