One thing I did after reading some posts here was to lower the front arm of the rear suspension to the lower hole. This made a noticable difference in the heaviness of the steering. If you look inside the tunnel where the front arm attaches, there is a steel doubler plate with the hole already there. You just need to center punch and drill out the aluminum tunnel. Then re bolt up the front arm to the lower hole. It lowers the front arm about 1/2 of an inch.
The disadvantage is it raises the angle of attack of the track, but I have not experienced a difference in trenching from the original setup.
Also, do a search on the "Geo" mod. Geo is a member here who has done alot of M series suspension mods that are simple to do and work well. I have not tried them yet on my M1K, but did the recommended mods on my previous M7.