Anyone here who actually negotiated hard on a Bengaluru property?

Builders in Bengaluru are just playing games with these 'final' prices. I'm trying to upgrade to a 3BHK near Arekere for the kids' school, safety is my wife's priority. Prestige Group ka ek project dekha tha. Initial quote ₹1.8 Cr, but later PLC, floor rise, parking, interiors, sab mila ke ₹2.1 Cr tak jaa raha hai. Negotiation pe toh they don't budge much, hardly 1-2% bola. Does anyone actually manage to negotiate properly here? Aur yeh hidden charges, inko kaise avoid karein? Booking ke baad hi pata chalta hai sab. So frustrating, yaar.