The tire dealer's spec sheet would have been provided by the alignment machine manufacturer and very likely has condensed most of the 1983-1994 (or possibly including 1997) RWD 700 and 900 series cars.

Camber has a slight adjustment range, but if they are equal (side to side) and no tire were is evident - you leave it alone.

Caster is not adjustable. Front-to-rear ride height will have the biggest effect on this angle. If there is drifting/pulling caused by more than a 1/2 degree variation that cannot be corrected by replacement of worn or bent parts, modified length reaction rods can be purchased at Volvo. Increasing the angle improves on-centre feel and cornering traction but make the steering feel heavier. Again, if it aint broke - you dont touch.

Only three things can make these go out... something is worn, something is bent (either a suspension part or the chassis itself), or spring sag / ride height. I am not including a man made fault where something was assembled/bolted improperly.

Toe, is the most important tire wear angle, and everybody's spec will probably be 1/16" to 3/16" positive toe (rule of thumb for RWD).

If the car is not pulling or wearing tires... it's perfect. The only thing a mechanic can really adjust under this condition is your wallet.