"firmly chose" is a grammatically correct phrase and can be used in written English.
Example: The team firmly chose to focus on improving their communication skills in order to enhance their performance.
I firmly choose the latter.
I know some writers, like Joe Michael Straczynski, won't write a word until the title's been firmly chosen.
Minor controversy followed the Vuelta; Contador alleged that Leipheimer was not being a team player by seeming to ride the Stage 20 time trial with the aim of winning the Vuelta, after Contador had apparently been decided as the team's leader, though the team had not firmly chosen a leader as the race began.
In addition, many believed firmly that the Clintons chose to live in New York State solely for political purposes -- and that they would abandon the area if she lost to Mr. Lazio.
Although what O'Neill produced during that year (1914 15) owed little to Baker's academic instruction, the chance to work steadily at writing set him firmly on his chosen path.
"I really firmly believe that the men I chose would have been able to deliver something different," Lippi said.
The same system helps keep the front wheels firmly nailed to your chosen cornering line, making the Mini feel very firmly planted on the road.
Even though I firmly support the project, I wish I knew why the Cordoba Initiative chose the financial district site.
The ring I'd chosen fitted firmly on my wedding finger waiting to be joined by a slim gold band.
The policy has fixed political debate firmly on Labour's chosen ground - the rising cost of living as inflation outpaces wages.
