I using Falling Sky weapon and rune ring 28% for rune attack. Without ring i have 120 for that first rune attack of that weapon, with ring ~130 dmg. I see change but its not 28%. I check with another rune atack without ring 80 dmg with ring 90. Always +10dmg. Maybe i not understand formula.
Second issue is Falling sky perk, where you have 28% additional damage from Rune Atack for 5s after rune atack - it doesent work for me, nothing change to my dmg thru that 5 s