Hi,
police cannot make the charge or the chargesheet weak in any sense if the complainant is strong, if they really make the charge sheet weak the complainant can file a protest petition in the court and ask the court to give order so that the police will re investigate the case,
forget about evey thing as u are on bail leave it to them, just appear in court when ever ur date comes.
it is the headace off the complainant to make the police file the charge sheet so that a speedy trial can go on.
if u want to do some thing file a Quash petition in the High court challenging the FIR, by saying that all fale averments are made in the complaint.
I advice giving money to police is waste, instead ahead with the Quash petition.