% chance of +4 to +5, +5 to +6 for armor, and +6 to +7, +7 to +8 for weapons

[Sparkzzz]

Just wondering the % chance of:
+4 to +5 for armor
+5 to +6 for armor
+6 to +7 for weapons
+7 to +8 for weapons.
I am more curious towards the armor. Here is a list of my fail for trying to get +6 highguard:
+4 to +5 - 6f 3s
+5 to +6 - 3f

[Alchemia]

This question has been asked multiple times and thus has been answered multiple times. Look a little. Some interesting reads.