We were there Columbus weekend and used FP+ for the first time. I was VERY hesitant, but I must say I liked it. We could only use three FP, which was less than we normally used, but it was more calculated and we didn't have to do the mad dashes at HS to get TSM tickets (or other rides). To the OP's point... we found it easiest to just change to get the three attractions we wanted. Once we got the three attractions (regardless of times), we could individually manipulate the times for each attraction. We got everything to work as we needed. The system doesn't let you see the available times, but once you have a time for each attraction, we we could change each individual attraction time to more closely align with what we needed. Not saying that is the greatest, but it seemed to work. Good luck and happy travels!