Hi guys after several days I'm hearing something not right with my IT00, i can hear right earpiece is slightly more unisolated ( mostly from lowwer bottom of earpiece ) and slightly more bassier then left earpiece
then i try to inspect and guess what

i found the housing is not evenly sealed especially the right one
then i thinking hummmm what i can i do....
ahaaaa idea is

i use Bantex Tack-All
it something like Tack it but white one luckily

then i try to cover the gap between the housing little by little

until all the gap is filled on both earpieces
CAUTION! carefull around the Nozel, MMCX connector and vent hole
Okey then i check wow it's perfecto
now no more leaked, better isolation and no more Bass imbalance

don't forget clean all the residual from tack all
Hope it's help if you had same issue like mine, and don't forget " DO AT YOUR OWN RISK "
Cha