RFID CARD Reader design and code optimize

We have an RFID Card + QR code reader, developed with NXP PN7150 IC, a QR Code reader module, ESP32 as the microcontroller, and some other peripherals. The PCB ,antenna tuning, code(micropython)is done in-house. The RFID card reader is used to read , ISO14443A ( MIFARE, Desfire, ) and ISO15693 Cards. Only CSN reading is done for now and no key or key management is implemented whatsoever. We are successfully reading the above cards. Now, we are facing a few problems in the functionality 1- The read distance is very low (only about 15 mm read distance for mifare, desfire and 45 mm for iso15693 cards, this should ideally be around 45 and 60 mm respectively.) 2- The read speed is a little bit less than optimal, the card has to be presented and held for a little less than 1 second, this should be ideally imperceivable (card being read almost instantaneously). 3- Although we are able to read the Generic ISO-15693 cards, we are unable to read the HID iClass Cards which also are ISO 15693 compliant. Note:- The HID iclass cards are being read on HID readers and generic iso 15693 cards are not read on hid readers. Problem 1 is probably related to the hardware, and antenna tuning. Problems 2 and 3 are probably related to the code