+ % damage
0% to 10% = 10% extra damage
6% to 10% = 3.77%
7% to 10% = 2.8%
8% to 10% = 1.85%
9% to 10% = 0.92%
disc
0 to 12 = 15.86%
9 to 12 = 3.54%
10 to 12 = 2.33%
11 to 12 = 1.15%
ias
0 to 7% = 7%
5 to 7% = 1.9%
6 to 7% = 0.94%
Damage range (assuming your initial blue damage range is somewhere near these examples; max range means 1560-1940)
1318-1609, roll to max range =14.75% damage increase (worse case)
1340-1650, roll to max range =12.9% damage increase
1380-1700,roll to max range =10.4% damage increase
1415-1750,roll to max range =8.1% damage increase
1450-1800,roll to max range =5.9% damage increase
1470-1840,roll to max range =4.4% damage increase
1480-1850,roll to max range =4.0% damage increase
1510-1875,roll to max range =2.6% damage increase
1530-1900,roll to max range =1.6% damage increase