there are several ways to count the abis congestion, so maybe you are not looking at the right counter ? I don’t have them in mind, though, but you should get them from the abis objects in NPO, not the cells.
however, as i said, the abis might not be the problem : the other cause of this congestion is due to GP overload
“or the MAX_TBF_TRX_DL_GP[U] constraint.”
and this is not causing ABIS or ATER congestion. It is something else altogether, and you can verify it by checking the MFS object or GP object/kpis in NPO.