Our tabernacle sets on the High Altar so I sometimes only bow toward the Tabernacle during Mass such as when I approach to set up the altar with the sacramentary in my hands, then again after I take up the Chalice and when I come down, I bow again.
Fr. wants the bells on the left and the credence table in on the right so I have to cross behind him during Mass twice. Once to get to the bells and once back.
Before the consecration I bow on the way to the bells but after the consecration and sign of peace on the way back to the credence table on the other side I genuflect behind Father at the same time he does. Other than that I only genuflect when lighting the candles and putting them out which requires crossing the Tabernacle.
It takes several trips to clear the sacramentary, vessels, patent, bowl and cruets from the credence tables so that I only bow from the doorway of the sacristy, except when I have to cross by the tabernacle to the ambo to extinguish candles.
Before the washing of the hands I will take father any extra ciboria he may want and we bow to each other. After communion, at the purification of the vessels we also bow to each other when I take him the water and remove the vessels from the altar. We don't turn pages or act as lectionaries or EMHC's so there is no other crossing in front of the tabernacle other than distributing communion at the altar rail when communion is in his hands.
