my formula is targeted at a more precise amount as you forgot the variable of "desired block percent" which i dont see in your equation, the correct equation to fig out required dex is:
{[.75(2*Clvl)]/total blocking} + 15 = Dex required <--derived from total blocking formula
Right, my equation was derived from the same formula, I just seem to have gotten a different result when reversing it to solve for Dex.
Fuck, it's been years since I've done equation work. I need to go back to school...