With stock control arms and bushings it's unlikely you'll ever get more than about +2.5° of caster, usually less. A "bit over" +1° would match up with a stock rebuild using non-offset bushings and the alignment not maximized for caster. The caster is absolutely
NOT your problem. In fact, if you're running radial tires that's not really even enough positive caster. Using the factory alignment specs with radial tires is a big mistake, the factory specs were for bias plys which are different in their construction and handling. +1° caster with radials will feel like driving a shopping cart.
With radials these are the specs you want
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