Very stable with 4-4" feathers. Like the 75-105 with a broadhead.

I have four fletched 4@90 4 inch feathers for years and will continue.  Arrow is more stable, more universal with other bows and the older I get the better I see the flight of the arrow, one of the TRUE pleasures of shooting traditional.

I was shooting this afternoon with the 2" 4-fletch. I was shooting 3 arrow groups with one broadhead and 2 field points. I was shooting sitting in a chair from 16yds. I have a pic of a typical group. It shows there is no problems with using the 2" fletching!
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Bisch

What you shooting there Bisch?  120x60. I think I figured out how to do it on my tower jig just waiting on missing parts to show up.

75x105

I just recently got some new nock receivers for my jig, so the next ones will be 4x90, and we will see if there is any perceivable difference.

Bisch

I shoot 4x90 2.5" on my beman's and they shoot great. Never have to worry about knocking the arrow the wrong way