I 100 % disagree with your numbers.I think far more "pass" than what you are saying. I know I dont but I enjoy getting as close as I can.
I had an interesting experience the other day. Tobie my spouse and I have had a youn TG friend coming to stay with us for the odd weekend for the last few months. On one such visit, I met her up at the carpark to walk her to our place .
Now to be fair, she's TG not CD but she's also pre-hormone TG which puts her squarely at the same level as a CD.She's also a young TG in her early 20's so doesnt have some of the telltale signs like heavy facial hair, but she definitely does have some and if you look closely you'll see it.

As she was getting out of her car, there were a couple other vehicles parking at the same time. Mostly filled with men. They all paused to check her out as she gathered her things and got out of the car.

It was at that point I realized they werent assessing whether she was male or female. They were checking out her ASS in those jeans she had on. VEry clearly they had no idea, and were looking at her as they would any woman on the street, with desire. Cant say I blame them she's rather hot I'd love to be able to say she's the only TG or CD I know that DOES pass, but she just isnt. I know at least 6 like that of 20-30 I know well enough to have studied them personally and spoken with them who unless you were told, you would never know. Even with my limited experience, sherri the numbers are much greater than you're suggesting and I'm not in a position to know all that many.
Now as you say, the voice DOES tell a tale. That said this is one area as CD's , we just let ourselves down.Because female voice an mannerisms are attainable, and there's many how to's on the net, all of which say practice makes perfect.We could pass on voice, but for 99% of us, we choose not to. ( Amanda reminds herself to do some voice training this week!)

Oh...and I'm with the previous poster. You dont need the mask , what you're lacking isnt female face but confidence.

Amanda