Aditi and Mehar are a shot ahead of third-placed Gursimar Badwal (77), who is at 157.
The only other player to score in the 70s on the second day was Amandeep Drall (81-79) who is now fourth at 160.
Milie Saroha (81-80) and Anisha Padukone (80-81) were tied for fifth, while Gauri Monga (82-81) is seventh.
Millie Saroha and Raksha Phadke (83-81) were top-two in Category A, while Aditi and Ridhima Dilawari (86-83) were the top two in Category B.
Harnemat Toor Singh (93-90) was the leader in Category C ahead of Tanrika Singh (96-91) was second. In Category D Tanishka Kumar (86-86) was the leader and Vasundhara Tihara (91-91) was second.
