I'll agree on the difference in feel between the 2 bows, but I'm in a similar situation. I've had 2 Classics, both Boo, still got 1. And 2 Sheltons, both Elm, still have 1. So I'm not sure if its the SF or the Boo VS Elm.
The Shelton you have now was mine not too long ago, sold it to Shinken a little while back. Grip was too small for me, loved the bow otherwise. It was a stock bow Steve had on the rack at the GLLI.
Next month I'll have a Classic with Elm limbs so maybe I'll get the answer to this question.
FWIW..Steve dont use red elm, its just regular old american elm he cuts off his family property.
Eric