Im very curious about your XL XStream. I had a standard frame XStream with the standard hoggie seat.   I sold the bike to Jay when I need some quick cash to pay my property taxes.
Is your seat also and extra long seat?    
Im 6"2 with a 45" x-seam.  I could not get comfortable on the standard hoggie seat because I was too tall for it.  I recommend getting a head reat.  When you lay back the seat its nice to have your head supported.  Some guys dont like head rests because they bounce your head around a little.

I've run both a Hoagie and Sling Mesh seat on my Xstream. The bottom bracket has been moved higher on the new Xstreams though, so a direct comparison between my old one and a new one isn't really valid. On mine, I found my body position to be too open to suit me with the Hoagie reclined a lot, a problem that would likely be less so on a new Xstream.
 
All that said, as a general rule, with a very reclined seat position, Euro style seats like the Hoagie are more comfortable, while with a mesh seat like the Sling Mesh, a more upright seat position works better. Recumbent seating is a very personal thing, though, and what works for one person won't necessarily work for the next. I suggest trying an extremely reclined position with the Hoagie before you give up on it, though. The fact that it bothers your hip suggests to me that you don't have it reclined enough. It should be reclined so much that your weight is spread out all along your back, and not mostly on your hip. Like I said though, recumbent seating is a very personal thing. It may take a lot of experimenting to find what works best for you. Good luck.

 I am at pinhole #2 which puts the bottom of the zip tie in the middle of the seat about 1/4" above the tire.  My extra height and leg length pretty much determines where the seat has to be on the top tube and being able to clear the tire limits the rake.  
 
  I suppose if I went to shorter cranks, I could get more rake, but that seems like a radical step for little gain.
 
  

Quote from BikeEB on Apr 22^nd, 2013, 6:21pm:

Wow, sounds like you're not going to get more recline. Trying out a Sling Mesh sounds like a worthwhile project.

Here are some pics I took of the two seats on my Xstream, not moving the seatclamp.  I put the SM seat on, and could get it to pinhole #10 before bottoming out on the struts -- so I got CLOSE to the same seatback angle.
 

 

 
 
However, as mentioned before, the 2009 SM seat puts you about 2" higher than the Hoagie does (which they may have changed since).  I drew the line where you would theoretically "bottom out", so to speak   , and had the marked box behind as a height reference.
 

 

 
This difference in height is what contributes to your knees being a bit higher, regarding handlebar clearance.
 
Hip "open" angle is about 145 degrees in both situations.  I moved the baseline up to intersect approximately where the hip joint would be in both cases -- so I'm not sure a SM seat is going to help your hip discomfort issue if it's related to angle.
 

 

 
 
Again, however, the SM seat is not going to give you the same upper back support in "push" mode -- the Hoagie top angles in at about 35-40 degrees vs. the back, and the SM seat only angles in at about 20 degrees - plus, it's mesh, not steel frame.
 
But it's still worth trying if you can get over to Hays!  Riding comfort is a very subjective thing, no?
 
 

Quote from BikeEB on Apr 21^st, 2013, 8:57pm:

 
The sling mesh seat may be the best recumbent seat ever made. It is more comfortable than all other seats, IMO - hang whatever wind advantage, real or perceived. I ESPECIALLY like it on the Xstream. Personally, I wouldn't ride another seat on that bike, despite Paul's very convincing trigonometry.    

Partially thanks to Bruce's post, I dropped down to pinhole #2 on the seat strut as a test...  still had room above the rear tire, but definitely needed more headrest support -- and the handlebar was just to darned high in my line of vision.  
 
Sooooooo.....   I dismantled the bars, and cut another inch off the riser bottom section (cutting a new relief slot as well)...    Seems to work pretty nicely!  Don't know if I'll stay at that recline, but it at least makes it feasible.
 
Paul