Those most relevant and active tuners for what you are looking for would be:
McNews Automotive in Dillsburg, PA
Top Speed Performance in Winterville, NC
FSWERKS in Anaheim, CA
All 3 are great tuners.
-McNews is a great place with probably the most honest tuner in the business and have been in the Focus game since the beginning.
-Top Speed has tuned the Highest Horsepower Focus in the USA and has the dyno sheet to back it up.
-FSWERKS has been in the game a long time (since the beginning) and are the primo primo of Focus Parts Dealers and Creators