With rings there is a affix that adds flat physical throwing damage and reduces mana cost by 3 which I really like, I use %throwing damage on my amulet and I also get the glancing blow set prefix on it which takes up the only other slot for damage.
I mostly do physical damage with hammer throw so I add %physical damage to my weapon which does in fact increase all physical damage ranging from on hit to damage over time such as bleed. I also crit a fair amount of the time so I get crit multi though I could just get %crit chance too to crit more often.
I went paladin because I really wanted holy aura but I have felt it lacks somewhat damage wise when I compare it to when I played forge guard. honestly either one will probably be just as good. If you have problems with mana costs I recommend grabbing volatile reversal by spending 5 points in void knight, it solved all my mana problems as long as I time it right and adds some damage too.
Life on block is worth it if you spec block, though if you are playing sentinel with a shield I don’t see why you wouldn’t.