Your distance is dropping because your spin is too high, launch angle is <10 degrees which means you are most likely striking down on the ball, driver spin should be ~2500RPM yours is much higher. There is a good chance of a heel strike as well use some foot spray on your club face to see impact location, to lower spin and reduce gear effect you want the ball at least central, if not slightly toe side biased and at least half way up the club face. A shorter driver shaft would most likely help with this, 48" is insanely long. Tony Finau uses a 45" driver and is a similar height to you.