What specific drills helped the most?
What are you using to measure the speed?
I would assume you have never used HGH or steroids or ever thought of using them or have ever played for the Yankees?
A picture of me without a shirt is enough to get the free pass on the pee cup. If I looked like this and had taken steroids, I'd sue the company for false advertising.
I think it's called Swing Speed Radar (about $99).
I've got to test some more to see which drills helped the most.