Remember, i said that to use the shortest club you can that doesn't result in a large loss in swing speed. Sweet spot contact with a slower speed is better than off sweet spot contact with a faster speed.
If you can control a 46" and hit the sweet spot consistently, there is no need for you to drop down.
However to pick the length of your irons to produce a certain distance is bead clubfitting imo. Fit the iron for good posture and center face contact. If the ball doesn't go far enough, bend the lofts a little stronger and/or learn to swing faster.
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I'm not a TGM or PGA certified Pro, but I did stay at a Holiday Inn Express last night
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