I'm not sure how-long you've lived in Florida, but knowing what damage can be done in a hurricane, you don't want to compromise on your safety factors. If you really wanted to gain a couple inches, contact a P.E. and get a superior rated piece to replace your existing struts/beams. Something with a closed-box profile, with thicker walls, and a metal coating to prevent it from deteriorating over-time would probably do the trick. The method of attachment should also be examined to ensure that the design parameters are met which equal or exceed the design specifications originally accepted by the State of Florida. Since I expect your most-valuable investment in tangible property is your home, you want to keep its windload rating intact, not-to reduce it.
The big push to change windload ratings and methods of construction occurred after Hurricane Andrew. I was on-duty for that as a firefighter/paramedic in Broward County (adjoins Miami-Dade Co., to the north) and seeing what happened, even with newly-constructed buildings, having their roofs breached and removed by the wind force, you don't want-to lose your windstorm protection. Arvide Corp. (part of Disney) had a prestigious housing development in southern Miami-Dade County, Country Walk. I had a family member who purchased a two-story home in the development, and she was pleased with her new purchase.
Hurricane Andrew was supposed to make landfall at the Miami-Dade and Broward Co. border, which would have put the windstorm right on-top of where I was working. At the last moment before making landfall, it went to the south, and hit southern Miami-Dade Co. The devastation was unbelievable. Tens of thousands of housing units and other occupancies were demolished. I recall seeing a CBS church probably 20 miles from the initial landfall, where the tie beams and columns failed, causing the eastern exposure wall to catastrophically-fail.
My sister-in-law in her new home, lost the roof when the gable end failed, which caused the entire second story to collapse. They took the insurance check and moved to Broward County.
Many of my fire-rescue co-workers lived in Miami-Dade Co. I went to there to help one of them tear-off his roof and to dry it in. He was luckier than a lot of people in that he didn't lose the house. Standing on the roof, and looking as-far as you could see, it looked like a warzone. Some homes were totally-demolished, others were just four walls, some, like my co-worker's, just lost the shingles and felt, leaving exposed the sheathing. In the trailer parks, the chassis remained, but the structures were scraped-off them. Debris was everywhere, blocking roads. Powerlines and traffic control devices, and road signage were inoperable or missing.
The Florida Building Code (FBC) underwent drastic revision, and has continued to be modified as research provides more data. One of the people I know in Miami-Dade County government is a P.E. who is responsible for the testing for Miami-Dade County Product Approval, for building materials and methods of construction. My alma mater has built the Wall of Wind, which is used to provide simulation of Category 5 wind forces and is located in Miami-Dade County. It is used to test methods of construction and building materials for compliance with the FBC.
Before you make any changes to your system in-place for your protection of your home, consult a professional to determine what is equivalent to or that which exceeds your current doors' Notice of Acceptance under the HVHZ requirements of the FBC.
https://www.floridabuilding.org/fbc/wind_2010/flyer_wind_january2012.pdf
http://cgiwindows.com/wp-content/uploads/2018/02/Fl-Bldg-Code-6thEdition-2017.pdf
https://www.clopaydoor.com/residential/windcode-residential-information/florida-windcode
You may find some useful dimensions here, from the above link: WINDCODE GARAGE DOOR DRAWINGS
