Definitely possible. Once you roll a core stat affix, you can't roll another pure core stat affix, but you can roll a hybrid core stat affix. Only core stat affixes are exclusive, so far as I know. All other affixes can be rolled together.
IE, you can roll 200 Int, and then roll 100 Int + 100 Vit, but you can't roll 200 Int and then roll 200 vit.
You could roll your desired amulet and still have an affix left for average damage.
Every skill has a hidden proc coefficient that determines what percentage of your life on hit you get when using that skill.
FoT:TC has mediocre 75% coefficient but it procs off the cleave AND the punch, giving it an effective 375% coefficient over the 3 hit combo.
WotHF has a lousy coefficient unless you use the run that makes it apply holy damage over time. That rune gives you a 370% coefficient, but WotHF doesn't attack as fast as FoT, so you get less life per unit time. Plus, that rune isn't very good when you're maximizing attack speed, since dots are based on weapon damage range, not dps.
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IE, you can roll 200 Int, and then roll 100 Int + 100 Vit, but you can't roll 200 Int and then roll 200 vit.
You could roll your desired amulet and still have an affix left for average damage.
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FoT:TC has mediocre 75% coefficient but it procs off the cleave AND the punch, giving it an effective 375% coefficient over the 3 hit combo.
WotHF has a lousy coefficient unless you use the run that makes it apply holy damage over time. That rune gives you a 370% coefficient, but WotHF doesn't attack as fast as FoT, so you get less life per unit time. Plus, that rune isn't very good when you're maximizing attack speed, since dots are based on weapon damage range, not dps.