Jerry,
"When you say do not remove the glass, are you saying reduce from the sides?"
Yes, sir! From the sides. You'll need to thin the limbs. Side to side. Some folks like to sand the back and belly glass. I don't! As a rule. But if you have to .001" of glass equals 1lb. But you don't want to go below .030" total thickness on the belly side. So I guess you could remove .010" which would equal approx 10 lbs. But you have to be EXTREMELY careful doing so! I would not remove any back glass at all.
Basically you will have to do both to get the limbs down to the weight you want. You'll need to thin the limbs side to side and remove a little glass off the belly of the limbs.
Anyway you're looking at a lot of work! Could be fun if you like to do this stuff. Or if you think it is over your head...Don't do it! Basically reducing weight on a recurve is easy, BUT doing it right, not hurting the performance of the bow. IS HARD.