I don't know of any other mower that has a fully open diff like the Snappers. All the others will ratchet forward but not backwards when the drive system is engaged. That's why they maintain 2-wheel-drive on hills, which is helpful there. But the downside is that they don't allow as good maneuverability with the drive engaged, because a sharp turn requires that the operator actually push forward (increase the groundspeed) to make the outside wheel ratchet faster, while the inside wheel continues at the drive system's gear-driven groundspeed. That's a list of pros/cons for each system that must be weighed for each person's particular yard and needs. Unfortunately, there's no cost-effective way to have the best of both. I've been a Snapper user all my life, and moved to a house with a significant hill in the back about 1.5 years ago. I've actually been surprised so far that I can mow across the grade and it keeps driving pretty well. I was worried about this potential traction problem. However, my turf is not very bumpy, and this may be the big difference between the OP's and my results.

You may have long ago fixed this, but I had the same problem with my Toro 824. I kept what I did in my diary, as follows: After all the usual adjustments and suspecting the friction disk, eventually I decided that the drive pulley was riding way too close to the auger pulley, and found that there was too much slop or "play" in the main drive shaft, on which all the pulleys and drive contact points are mounted. I came to the conclusion that the far rear end of the drive shaft was riding too far down toward the front of the machine. This moved the forward drive pulley too far forward as well, away from the friction disk. On disassembly I discovered that on the main shaft there was a roll pin that had sheared off, allowing the washers to ride over it and make all the mechanism sloppy enough to keep the friction disk from making proper contact. I bought a new roll pin from Toro for $3, and it made the drive mechanism run like new. I hope this helps.

The weights hang low on the rear bracket and make your X300 look like a big tractor. If my tractor had a built-in weight bracket I'd get the weights. WWAF in the tires gets the weight below the axle... about as low as it can be. Only downside is that it's a pain to put the fluid in and if you don't add tubes the inside of the wheels may rust. If you search all the L&G tractor forums you'll find oodles of posts like yours and adding weight resolved the traction problems almost all the time.

OK tmajor, just for you you brick totin' son of a gun. The insurance agent knocked on Mr. Jones' door. Mrs. Jones answers and takes him to Mr. Jones bedside and gives him a chair. He then says to Mr. Jones, "The home office has sent me to investigate your claim because of the many injuries listed on the hospital bill. Would you please describe how you sustained all these injuries?" Mr. Jones begins, "We had been building a 3 story brick facade on a new store and I stayed after quitting time to finish and clean up. There were a good many bricks and "bats" left over. The roofing company had erected a derrick with a pulley and rope so I found an empty wooden barrel and tied it to one end of the rope. I hoisted the barrel up to the top of our scaffold and tied off the rope to the bottom set of scaffolding. Then I climbed to the top of the scaffold and started tossing the bricks and bats into the barrel. It was a big barrel and I was thinking how lucky I was that I would only have to fill the barrel 2 times to clean up all the bricks. With the barrel full I climbed down and as I was untying the rope, I figured the barrel would be somewhat heavy so I wrapped a couple of loops of rope around my left hand so I wouldn't lose my grasp of the rope. When the last knot was untied, I was suddenly yanked upwards by the falling barrel, dislocating my left elbow and shoulder. At mid point the barrel struck the left side of my head and neck, giving me a concussion and a broken collar bone. I continued upwards and came to a halt with both hands buried deeply in the pulley cutting them badly and breaking 4 fingers. When the barrel hit the ground the bottom broke out dumping all the bricks. I began falling and the ascending barrel struck my right side breaking my leg and elbow. When I hit the ground I broke both my ankles and fell face down on the pile of bricks deposited by the broken barrel, knocking out several teeth and breaking my jaw. I then turned loose of the rope. The barrel struck me for the last time breaking both thigh bones and my left pelvis.