What I would do Mugana is make it so you have 75 block with HS on. Then, every time you level from now on, add just enough dexterity to keep your block at 75 (since chance to block goes down as you level up), and put the rest of the points into wherever you would like (vitality, strength, or energy).
Nitpick: Chance to Block does not go down, but the required amount of dexterity increases.
And no, it's not the same. If Chance to block would go down, that would mean you couldn't reach the higher blockings anymore, whereas if the amount of dexterity needed is increased, you can of course reach it.