The pair had been fourth seeds in the Open men's draw but were bundled out in the quarter-finals.
However, in an email, Bannister said that had proved to be a blessing in disguise for them in the Over-35s because also being in contention for the Open title would have meant playing two games back-to-back and going into the masters final on empty tanks.
Instead, he and McSherry were able to get a couple of hours' rest after winning their semifinal 2-0 over former world No3 and Hall of Famer Stu Davenport and his partner Mike Weston.
In all, 160 pairs took part across all categories at the doubles nationals.
Bannister's win added to the New Zealand and Australian Masters singles titles he won last year.