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I was wondering about something similar. Like many guitarists, I usually play with the left side of the nail, especially on slow pieces. But when I play fast pieces (for eg. Etude no.1 by HVL), my A finger is hits the high E string with the right side of the nail.
While I've worked out the nail shape for my I and M fingers (ramp from left to right), I'm still not sure of my A fingernails. So, I've kept that more of a neutral shape.
I agree with Dave on Thomas Viloteau. I watched one of his YouTube lessons on nails. He seems to have a ramp on the A fingernails going from right to left. I might be wrong.
You could check out Mircea Gogoncea's livestream on nail shaping as well. If I remember correctly, he commented on someone who had an A fingernail shaped with a ramp from right to left.
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I believe it was Mircea in one of his livestreams that mentioned he would hold a file along the string and 'play' each finger so that the file would mark the angle he used. Then he would file his nail to match that.
I don't recall his mentioning the right side of the nail, but this technique would give an idea how you could file your nails to match how you play.
It probably makes more sense seeing his demonstration than my telling it.