Mine is equipped with the Fox shocks. The sled has not got the perky "ski lift at will" tendency any more. I rode mine with the rear stop removed. Like I said in the last note, I miss that. Weight transfer is now just OK. I had hoped to maintain some of this playfulness(not that I've given up on that idea. Like I said, I'm only into this for 400 miles or so).
What I received in exchange for the loss of big weight transfer so far more than makes up for it. I had installed the M-10 in the hope of building an extreme trail sled. I think that is what has happened. The capability I now have on trails in any conditions easily justifies this loss. It's not that I can go through the rough a lot faster, it's the fact that I can do it all day long without feeling beat up. Speaking of fatigue, the vibration and noise levels are very low with this big motor. I'm turning 500-1000rpm less than the smaller triples at trail and cruise speeds. Fuel milage is the same.
I used to run the front spring adjusters all the way down using the Xtra-10 suspension. With the M-10, I'm playing with that setting (and a lot of others). Right now they are set up pretty high, about 3/4 of the way up. It seems to stay pretty flat off jumps. Like you suspect, I was a little concerned about the capabilities of the stock front end at first too. That concern has proven to be a complete waste. The front end has not been an issue. It handles as well or better than anything I've been on.
Installation is not for the timid or the person who is not pretty sure of his mechanical abilities. Mechanical abilities also required to properly sort things out after installation.
Great for tinkerers.
Did I mention how much I like this sled?
AL