The thing is, that, if You use profile You've provided, You can "trash" voltage settings provided in "active frequencies", as SR is calculating and overriding them.

To be absolutely sure that it's SR fault, *disable* both SR (or, at least, VDD1), and check if Your device is absolutely stable with Your profile. If yes, enable SR again, and check SR calculated voltage for 850 and 900, and put result here. We'll be able to see, how much of a difference is in calculated values, as compared to Your "default" profile values.

/Estel