My opinion is,
the best way is to file a WP (Article 226) and state all of synopsis and pray accordingly.
RTI sample application is also available in my links bellow.
Please see clause (h) of Section 8 (1) of RTI Act 2005.
"information which would impede the process of investigation or apprehension or prosecution of offenders" - are prohibited until final Charge-Sheet is filed.
So please apply RTI only after final Charge-Sheet.
Please apply for Certified Copy of FIR and apply in HC for speedy trial on priority.
Please read each of my posts carefully in the following links for sample petitions and other necessary clues.
https://www.lawyersclubindia.com/forum/Fight-against-misuse-of-498a-ipc--103100.asp#.U6gslUCm9dg
https://www.lawyersclubindia.com/forum/Best-way-to-fight-against-false-498a-103111.asp#.U6gsRkCm9dg
https://www.lawyersclubindia.com/forum/details.asp?mod_id=104564&offset=1