Re: From default NV at 75 vert HZ to nvidia at max 58Hz, what's wrong?
You're getting 58Hz modes because of your modelines. What happens when you don't put them in? Or rename them so they aren't using the same Modename as the defaults?
The driver does report lower than expected Vert and Horiz rates.
Also why do you want to drive your LCD at a faster rate than the LCD optimal 60Hz? You're not using a CRT where a gun is constantly scanning, and you would want 85Hz or higher to prevent flicker.
Arch64 w/ Vanilla 188.8.131.52
Gigabyte GA-MA790GP-UDH4 / AMD Phenom X6 1090T / 8GB (4xDDR2)
GeForce GTX460 1GB PCIe Dual-DVI+miniHDMI