Hi Mike,
If you drill an Epic with pin below ring finger you are going to get a ball that reads the midlane a lot quicker and is not as strong at the backend. I have both of these balls with the drilling you were looking at. So to answer your question, the epic will be more aggresive in that it will start reading the pattern earlier, but it won't snap as hard as your rsx on the back. Hope this helps. If you want a ball that is more aggresive I would recommend the Epic Battle. Everybody that I have drilled one for absolutely loves this ball. The battle is a good 5 boards stronger than the original epic.
Justin Godfrey
RG Pro Shop Staff