That seems terribly low, wow.

I've been building my GLA with VIT first and DEX second because I figured it would be similar to XI where your abilities will generate far more enmity than your damage output reasonably can. Not to ignore damage entirely, as it is helpful for generating hate, but I figured STR & MND will go up high enough naturally so why not boost my HP/DEF and Accuracy/Block Rate.

Anyhoo, given those numbers, that means that with the Relic Shield you'd have a base chance to block of 20% + your DEX modifier...

That just seems far, far too low especially if the cap is 75%