I live work and play in Panama City Beach - a few thoughts to share:
1. Summer is the high season here is 12 weeks - Memorial Day to Labor Day
2. The winter season, November to end of February you will be lucky to rent by the month what you rent per week in high season. Your per night "rent" will likely drop to 1/4 the high season rate.
I'd recommend calling a vacation rental company and ask them for an analysis of the property you're interested in by month. Don't focus on just the percentage of occupancy for the year. You will need 100% occupancy in the peak season, you will need very high weekend occupancy during the shoulder season (March April May September October) which is when we hold a lot of weekend festivals and concerts.
HOA fees are extremely high and if they are not including water/sewer/cable/internet/pest control in the fees then that is really nuts.
Also please keep in mind the fact that we had a severe hurricane Cat 5 in October 2018 and you need to ask if there are any special assessments pending.