Thanks for the info!
Sounds like I have my tarp set up correctly. It rained heavily last night so i used my hex tarp for the first time and it became even clearer that I was using it the right way as it had cord "storage pockets" at each corner that would have just collected rain runoff had I put the slick side up.
However, I've been laying in my hammock wrong. I've been laying with my body aligned perpendicular to the tie outs. It makes perfect sense that the tie outs would be there to give more room. It's no wonder I feel like my head is jammed up against the side of the hammock because it is...duh. Laying parallel to tieouts also makes the stock rain fly shape make more sense as it covers the tie out areas better than the non-tie out areas (my thoughts about the tarp shape seeming odd based on the direction I layed in also added to my confusion about which side of the tarp was "up"). I'm looking forward to a much better night's sleep on my next test hang :^)