I'd take the empty slide and install the bushing with some toothpaste on it. Then wotk the bushing with your wrench. Remove the bushing clean and repeat several times. Then reclean the parts and oil the bushing and work it again several times. The minor lapping will ease service in the future but not add any measurable clearance effecting accuracy. After any field or detail strip add a bit of oil to the bushing. The full length guide rod does not add any accuracy.
Joe
Joe