Okay: from the description, try this.
1) LENS: There is a retaining ring on the back of the lens that holds it into the mount. If it is loose, the lens will be a little wobbly. One of my F1.4's was like this. SImple tightening of the ring fixed it up.
2) Focus stiff: The "proper" solution is to remove the focus mount and clean with Gas. I did that on one S2 that was really bad. On my others that were a "little Stiff", I took off the lens and back, set the shutter to "T" to keep the curtains open, and I squirted a little Ronsonol (lighter fluid) into the back of the helical. Work the focus and Dab up the now dirty lighter fluid with a Q-Tip. Worth a try before removing the helical.