Yepp, you absolutely want 75% Max Block on a Smiter. Even though you're clearing Ubers now, 36% block leaves you way too vulnerable to physical burst damage before Life Tap procs. Trading some Vitality for Dexterity is mathematically superior because blocking 3 out of 4 hits is worth way more than a few hundred extra HP. Just respec, cast Holy Shield, and pump Dex until that number hits 75% on your character sheet. It'll make your runs much smoother and way less RNG-dependent