We are making good use of 2500kg of GSLV GEO payload. INS Gen 2 sats are 2250kg compare to 1500kg of gen1.
"NVS-02, the second satellite in the NVS series, is configured with navigation payload in L1, L5 and S bands in addition to ranging payload in C-band like its predecessor-NVS-01. It is configured on standard I-2K bus platforms with a lift-off mass of 2,250 kg and power handling capability of ~3 kW"