Thanks for all the replies. Good information in every one.
We had some much needed rain the last few days, so I have yet to get out the mower since my post. I'm anxious now to check the pressure and examine the tires. I think that the lugs are somewhat rounded off, but I don't think that they are so bad that they won't work for my purposes.
I have gotten enough experience with it that I can operate on flat ground without spinning. A matter of practice and finesse.
My problem is usually when in the bar ditch along the road. I think what is happening is I am getting into sort of a reverse high center sort of situation, while on angle. We are in the boondocks and the road is a long distance from the house, so this is sort of a rough mowing kind of area. In fact I used to mow it with the tractor and shredder when shredding the pastures. Since mowing it short it makes the whole place look better and the Bermuda is taking over more and more.
I am going to start mowing our Veterans Memorial on a volunteer basis and I darn sure don't want to spin at all there. It is flat ground, but we don't have the grass in real good shape yet. It's a nasty black gumbo soil, so, I don't want to be spinning and digging while were trying to get grass established. This is my main reason for wanting to optimize my chances of not spinning. I want the memorial to look as pristine as possible to show respect for the veterans.
Thanks again.