The Pickaquoy side have won 10 games out of 10 in National Three ahead of Saturday's showdown with Preston Lodge.
Grammar lost 46-13 at Peebles while the GoGos suffered a 25-12 home defeat against Newton Stewart.
Gordonians are trying to catch leaders Lasswade, with Aberdeen Grammar and Highland also in rugby action on Saturday.
Gordonians picked up a bonus point win at Kirkcaldy but it was another disappointing weekend for Aberdeen Grammar.
Grammar return to Rubislaw amid a punishing schedule of away matches in National Two.
The Pickaquoy side sit second in National Three following a convincing win against West of Scotland.