You only need ~45% IAS to hit 4FPA with a base -10 weapon (Caddy) with a lvl 19-20 Fanaticism. I don't know where the hell you got 120% IAS...
http://www.diabloii.net/characters/p...ias-zeal.shtml
Maybe you're thinking for a base 20 weapon...


The +max damage in your armor does you little good, as it adds to your OVERALL max damage, not your max weapon damage.