Hidden charges are a total scam at possession

Spent the whole Sunday checking out options in Sector 150. Honestly, the hidden charges at possession are getting ridiculous. I'm seeing almost 10-12% extra over the agreed price, not just PLC, but EDC, IDC, maintenance deposits. From my experience, ATS tends to be clearer, but I'm hearing mixed things about Gaursons' final costs. Are others facing this, especially with projects near Yamuna Expressway? What did you do to manage these unexpected costs? It seriously impacts ROI.