1 pt in Str brings you 1HP, but also 3% damage bonus, so 36 Str brings 108% damage bonus where 30 does 90%.
It's exact if you only count str. But if you had PS damage bonus (i don't know how much it add exactly but let's say 10%) 10PS= 100% SO
10PS+ 30str= 190% and
10ps + 36str= 208% more damage
So the difference is not that significant anymore plus more Wpf also had damage.
That the number i got with cRPG calculator pack:
with 36str/10PS/118 wpf you do
(30cut, 10 armor)
* Minimum: 49
* Average: 52.5
* Maximum: 56
With 30str/10PS/132Wpf
(30cut, 10 armor)
* Minimum: 49
* Average: 52.5
* Maximum: 56
Exact same damage but one swing faster and has better foot work.