Craig, I have made several hickory backed osage bows and can say it is an excellent combo. IMO, they go together very well. I have not made a board recurve so I can't help with that but a Grumley recurve is on my list. Chris Cade(Mechslasher) made a beautiful Grumley Brush bow last year but I believe it was from a stave.
60" is not too short for 28" draw. I have made 60" osage static recurves for my 26" draw and always tiller out to 28". I'm looking forward to seeing the finished bow. Keep us posted!
Pat