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These are extra things added that are not necessary. If your intention is to approach the communion rail and kneel down, then genuflecting serves no purpose. By kneeling, you are already demonstrating the highest level of respect Blessed Sacrament. Besides if you are strict about it, when the Blessed Sacrament is exposed, a double-genuflection/slight bow is the proper respect due, which you are already doing when you are the communion rail anyway.

Same for Sign of the Cross. The actions of the priest and of the communicant, upon proper receiving of the Blessed Sacrament, more than suffices the necessary proper adoration. In fact, making the sign of cross is an opportunity for an accident to happen and is usually done in haste. There is something special about communion, the fact you possess our Lord, that these extra things area distraction and diminish what you just did. 

Also, I was taught that you should not do 2 acts of adoration at the same time. Genuflecting and sign of the cross each have their specific meaning and purpose behind them. Mixing the two acts together actually diminishes that purpose and people due it out of habit vs. mentally contemplating why they do something as they are doing it. 

When I see people adding more things to simple customs that the Church teaches, I wonder if they actually know why they are doing it. Even for me, I have to remind myself why I am genuflecting upon entering a pew , that I silently say to myself "My Lord, My God" as I am genuflecting. If I don't, it feels like I just do things out habit.

Reading this again I see I ought to clarify regarding the genuflection:
The traditional priest taught us to do a normal genuflection if on our way to the communion rail (on the right or left side of the altar), we pass by the Blessed Sacrament in the Tabernacle. He said it would not be necessary if our position at the communion rail was directly in front of the Tabernacle. The priest I am referring to in both of these posts was from the SSPX.
But if the priest had come down from the altar to distribute Communion the tabernacle would be empty.

I assume that means if you cross in front of the Tabernacle on the way to the rail, but when the priest is distributing Communion the Tabernacle is empty.  

Just as a random point of information ... A Tabernacle may not necessarily be empty during the distribution of Holy Communion.

• A Tabernacle may have more than one ciborium and a single priest will have only one out at a time.
• The priest may have consecrated new hosts in a ciborium which remains on the altar while he distributes older Hosts from a ciborium which had been in the tabernacle.
• The tabernacle may contain a pyx for Communion calls.
• The tabernacle may have a lunette, a circular hinged glass container which holds the larger host to be placed in a monstrance for adoration and Benediction.

I agree, especially about the lunette, but the congregation has no way of knowing.
I watched Mass yesterday from Poland, the same SSPX church where women and men sit separate, and they not only genuflect before kneeling at the rail but also after.  It did seem to slow things down.