If the facts don't fit the theory, change the facts.
Here are links to modified versions of TheoryCraft and TankPoints that I've made. The TheoryCraft changes were to add support for ZG enchants in determining block value and a corrected strength formula for block. The changes I made to TankPoints builds off of the work Kinesia did and simply uses TheoryCraft to calculate block value (since it's a pain in the ass to do).
Anyhow, enjoy them warriors (and feral druids). They should provide a much more accurate representation of blocking. Note that TheoryCraft is required for this version of TankPoints - sorry, too much of a hassle to pull out the equipment parsing code. However, TheoryCraft is really sweet and shows you an accurate calculation of how much damage your abilities will do, and will learn mob armor values. It also allows you to see how much more damage you'd do by adding strength, agility, etc.