Your barbarian doesn't have 60-70 strength. None do - this discussion isn't about mod9 either. (well mine can hit 60, but thats for such a limited time using an item i basicly never use - scourge choker)
At real strength numbers - 40-48, WF with max power attack enhancements are missing allot vs current content. This is a fact. Hell I miss stuff on my THF Dwarf with -8 to hit, and +2 back from axe attack, for net -6.. -11 to hit? forget it. Add in the TWF penalty? Even unlikelier to hit everything fine.