At my parish we kneel during the consecration but just as the music starts for the great Amen we raise and stand. We sit when the Eucharist is in the Tabernacle. Is this fine?
In the dioceses of the United States of America, [the faithful] should kneel beginning after the singing or recitation of the Sanctus until after the Amen of the Eucharistic Prayer. (GIRM 43)