RE: 20 yard pin?????
I don't think it's such a big deal. I've been shooting one pin up to 30 yards for about 5 years now. And with bows that only shoot about 260 fps. Not that the arrow hits the same place. sighted in for 25 yards it's about 1 1/2" high at 20 yard and about 3 " low at 30. Not dead on as some people might think, but close enough for hunting within 30 yards.
Now my 3D setup, being a bit quicker has a spread of about 2 1/2" from 20 to 30 yards. That's right at 299 fps. 27" draw and 53#.