May sound obvious but some baseball cleats are heavy and can slow you down - My son 2016 OF achieves sub 6.7 (best 6.52) when he wears his very light weight soccer cleats - so when it really counts (showcase or PG) he slips them on to run. Maybe just coincidence or false confidence but this has shaved 0.5 off the 60. Of course when running the dirt base paths he uses the metal BB cleats but in the grass a shoe designed to run in grass and super light weight helps. Also he videod himself and took out head bobbing, worked on exploding first 2 steps, tries to run along a line or fence if present to keep a straight path, and tries to run against other outfielders when he can to push his competitiveness. When hand timing is the assessment the best you can do is run your fastest and hopefully pair up to run against someone else that is perceived to be fast and be "faster". Love the events with the laser start to end reads - only fair gauge in my opinion.