Hello Ramesh,
I have a feedback from our inhouse IQ expert. First thing that is wrong is your -gm and -gn settings. -gn should be at least 1.5* size of -gm.
They should not be the same.
It looks like a consulting job of a few days to sort through your tuning issue. Have you looked at the IQ manuals and sizing guide?
HTH,
Gek