Despite improved economic times and more education money from state lawmakers, St. Louis public schools are still facing difficult times. The union representing the teachers has put forward a proposal, last month, that would use retirement incentives to plug a $23-Million deficit. But too few teachers are taking advantage of the offer. This puts the St. Louis School Board in a position in which it will have to consider cutting some positions. District officials and union leaders suggest misinformation about the incentive plan might be playing a role in the low sign-up rate.