CA, Early on I had the same problem with my toe seams. I hated it when slipping my shoes off at Payless and the seam would be showing
My old GF was always crooked so I learned for both of us you have to be very careful to get them on perfectly straight to begin with and then hook up your garters very carefully to keep them that way. Keep the stockings taut, not too loose or they can move around.
I love wearing black seamed stockings with lightly reinforced toes!!!
Not a big stocking and garters fan but I have worn pantyhose with the seam up the back, They would stay straight as long as I wore a nice tight girdle, if I wore them without the girdle they never seemed to stay straight. Too bad because they do look classy with certain outfits, expecially when you are all dolled up.