10IF, 30 strength = 85hp
0IF, 30 strength = 65hp
85/65 = 1.308, ~30% increase
5IF, 15 strength = 60hp
0IF, 15 strength = 50hp
60/50 = 1.2, 20% increase
I do not understand. If anything, the percentage increase is worse for agility builds. When damage easily exceeds 25-40 in one hit in medium armor, what difference is a 10-14hp increase? Armor protects you more than IF, and cranking up athletics+WM+armor and neglecting IF would offer more protection and speed. IF is decent once stacked, but compared to PS and the other skills it's a little lacking and definitely feels like a last choice. Strength + IF is definitely strong, but strength without IF is strong as well with 0 skill point investment. WM is becoming more essential, IF is going to be the first to decrease/be removed entirely.
Of course, buffing IF and leaving everything else the same is just not an option. HP increase from strength needs a huge change if IF is ever changed. What I am trying to get at is lowering hp for 0IF and give a better progression to good hp if you decide to use IF, just like the WM change. Unlike the WM change, I do not mean increasing maximum hp if you decide to max IF, perhaps even lowering it for really high strength builds.