5'11, 200 as a sophomore and a 93mph exit velo is enough to get noticed based on numbers alone....but the real question is can you hit a ball that's coming from a pitcher....lol? 75 from the OF isn't enough to get real serious consideration as an OF yet....but keep working on it. a 10 yd time isn't a real good measurement of speed for an OF. Once you have a good idea on your current 60 time, people here will be able to give you a little more insight. Even with that, it's tough to say if you should attend a showcase based on numbers alone. When people watch you compared to others your age do they say "wow, that kid is good?"
Have you attended any "local" showcases? PBR, etc? Those are typically easier to get to and a lot less $$$. Maybe catch a local one as soon as you can and see how your numbers compare to others that attended. If your numbers are average compared to the guys there, then maybe it's not time for a PG showcase yet. If you're in the top 3-5 in all categories...yep, maybe you're ready. Good luck!