TPA3116d2 Help needed

Hi
this is my first ever Class-D Build...the schematic is almost same as datasheet and according to gain table the gain should be 32db if i'm not wrong but my mob volume is higher than the volume i got from the amplifier ... my source is the mob through Bluetooth module know that this module works fine with my other amps STK and TDA ones. my supply is 24Vdc and the chip starts to heat and needs heat sink when turning volume to max which is not sufficient at all it sounds like 7w R.M.S or so
i doubt the chip it self if its fake but may be and experienced one who build it give advice ...
thanks
 

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