I’m not sure what you mean by the times that were recommended at the top. Did you start out with one of the standard plans that has generic FPP recommendations and then convert it to a personalized plan?
At any rate, the optimizer does not schedule FPP reservations - it takes FPP reservations that you specify and then works out the best plan using them (or in some cases not using them if itcan work out a better plan). Check out Making Optimized Personalized Touring Plans with FastPass+ for tips on how to do this.