I'm 5' 8", 29" inseam, 180 lbs; and have tried dozens of combinations to get a more comfortable and low seat. I finally found a great solution, with an easy seat-mod plus the AirHawk R cushion. I described it in another thread, but the solution is so simple, I'll just describe it again.
First, order an AirHawk R seat cushion ($160). When it arrives, blow it up (by mouth is fine) then leave the air-**** open and let all the excess air out. When stable, tighten the plug so no more air can escape.
Next, remove the staples from the front half of the seat. Pull the cover back and remove all the stock foam - it will just peel away. Next, using either the stock foam or some other firm foam, cut a 2" thick piece to fit the front four inches of the seat - to raise it up to stop the slide forward. Taper it so that it flows into the seat base. Next pull the cover back in place, but do not staple it yet. Place the AirHawk R cushion on top, in the middle of where you'll sit. Put the bike on a rear stand, place the AirHawk R cushion on the bike. Climb on and sit. See how it feels. If it doesn't feel right, analyze what it needs (for example, more/less cushion in front, etc). Move the AirHawk cushion forward and backward till you like how it feels. Once it seems to fit your butt properly, remove the AirHawk R cushion, pull the cover tightly and staple back in place. Works well to pull each side in place with a couple of staples and slowly work your way forward, pulling the cover then stapling. If a problem occurs, remove some staples and start over.
When the cover is stapled in place, place the AirHawk R cushion where you think it should go, sit on it again and put the straps in place. Then turn the seat over and put a staple in each strap to hold them in place and up in the seat bottom.
If there's any doubt about comfort, take the bike for a little ride. As you move around, the air will move and give support to whatever portion of your butt is applying the most pressure.
I found this arrangement to be very comfortable. I can now ride long enough that my brain and back get too tired to ride, while my butt is still ready to go. I have a personal limit of two hours of riding without a safety rest stop.
However, I did find that, initially, my butt was a little tender from my prior riding. So, give your butt a day or two to rest before starting this project. This entire job can be done in a couple of hours, if you have the AirHawk R cushion, and a staple gun and staples before starting.
BTW, the cushion has an unusual feeling as you move around. It seems to move around under you. In fact, that seems to be the reason it works. It provides the most support under the portion of your butt that's pressing hardest. Be patient, and give it a thorough test. Worst case, you hate it; replace the stock foam and sell the cushion. If your like me, the cushion will rate up like Michelin PR3 tires, that had a huge positive impact on how I view my V (I have the "green" 09V). Always fast, and now has a very comfortable seat. BTW, I also increased the comfort by changing springs and shock. That's another story, if you're interested.