All of those are contributing factors, again the axle angle (castor) being the most critical. The toe will effect the directional stability and the tire wear. The slack in the steering isn't as critical, but it sure does great things for comfort and driving ease.
You can adjust the steering box for the slack issue and the toe can be set after the other issues are corrected. Find a professional front end specialist. They usually have a reputation among the street rodders and sports car guys. Most of your tire shops today don't have the knowledge or equipment to do this kind of work, so you'll have to look around if you don't already know someone.