All,
Thank you for the responses. I mentioned in the last post that I had ordered the MR Beartooth 80 and was waiting on the SG Xcurve to come back in stock which happened a couple days later. I ordered the Krux, Xcurve, and R3-5900 bag from them. After playing with each for a little over a week, I ended up keeping the SG Krux with the R-5900 bag.
All 3 frames and both bags were very well built. I loaded each pack/Frame with 32lbs and adjusted them per each companies "how to adjust your pack" videos on YouTube. For me both SG frames were noticeably more comfortable than the MR. The MR bag just felt heavier. I think that is because the SG belt and shoulder straps seem wider and distribute the weight across a wider area than the MR belt/straps. Also the SG bag holds the weight higher on the belt than the MR bag.
At first I was having trouble deciding between the Krux and the Xcurve, the Krux seemed a little more comfortable but they were super close, I ended up adding another 23ish lbs to both and that is where the Krux really pulled away. The SG Krux/R3-5900 with ~55lbs in it felt lighter/more comfortable than the MR with the 32.
Thank you for your thoughts/opinions.
matt