Welcome to the ROG forum !
I'm glad you like the overclocking guide, I tried to keep it as easy as possible without getting too technical. 🙂
I haven't used the ROG RX 460 much but when I did the overclocking the max voltage I got was 1.287v. Increasing the voltage does create more heat but with Asus's DirectCU II cooling we have nothing to worry about, if your's is going up to 1.325v it's not a problem as the ROG RX 460 runs nice and cool. I'm not sure what the throttling temp is for the ROG RX 460 but you can bet you won't come close to it.
It's perfectly fine to run with 1.325v, your max voltage is showing the same as mine 1.287v.
Nice overclock and thank you for sharing your results, if you have any more questions or concerns please ask.
Edit: After a little research I see the max temp for the ROG RX 460 is 95c.
DIdn't crash at 7600 mhz and 1336mhz, but will this cut lifetime of this graphics card and will it last for 4 years at least?