I'll take a stab at it
I believe Bartram Trail is the only one on the list who has had only one head coach and the fact of that stability is what makes them a great program as well as the fact their coach is very good at developing QBs which overall is not a strongly developed position in Florida historically compared to other power states
Of those 100+ schools that opened since 1992, only 13 have managed to win a region title. Here they are with the year(s) they won a region title. In parentheses after each is the county where the school sits. Those with an asterisk won a state title. An interesting stat...only one larger school that has opened over the past 25 years has won a state title...Flanagan. And as everyone knows, Flanagan was a bit of a one hit wonder.
Although they have never won a state title, the real outlier in the bunch is Bartram Trail. Arguably no school that has opened over the past 25 years has been so consistent. BT opened in 2000 and has only missed the playoff a few times. They have won 23 playoff games during that span. It begs the question...what is it about Bartram Trail that enabled this school to be so successful so quickly?
Bartram Trail 2007, 2011, 2013, 2017
Belleview 2000 (Marion)
Braden River 2015 (Manatee)
Cypress Bay 2010, 2012 (Broward)
Durant 2003 (Hillsborough)
*Flanagan 2014, 2015 (Broward)
*Northview 2010, 2011, 2012
Ponte Vedra 2016 (St Johns)
Steinbrenner 2019 (Hillsborough)
Viera 2015 (Brevard)
Wekiva 2017 (Orange)
West Florida 2017 (Escambia)
Wharton 2002 (Hillsborough)
Of the 61 "newer" schools listed above in 3 of Florida's major metro areas, 6 have won a region title(listed below) and 12 have won 5 or more playoff games since opening. 21 of the teams have never won a playoff game. It would likely be safe to say that the majority of these 61 teams have struggled to be consistently competitive.
Cypress Bay 2010, 2012
Flanagan 2014, 2015