I made an identical comment over in my attack speed thread, but to make sure I'm covering my bases, I'll repeat here -- 81/min base for THF is the older jjflannigan rates; personally, I saw more like 79, but nevertheless...
The problem with counting attacks is it has a *big* swing on margin of error. Consider that you can count 20 attacks over an interval where anywhere between 19.0001 and 20.9999 swing animations actually elapsed, and you have a +/-1 error. Add into that that the sequence timing itself is uneven, and you can have another error of +1 or so. So, when you're talking about a count of 25 and 31, you're really talking about a count of 23-26 and 29-32 normalized attacks -- which *could* be evidence of anything between a 12% and 40% increase...it tells you very little. As Shade alludes to, going for 60 secs is a bit better -- going for 2 to 3 minutes is better, still, and can probably get the error down to a few percentage points.
For what it's worth, I tried modelling this build with Yargore/A_O's DPS calc and my speed numbers, and it's "in the clump" with the other top-tier 100%-Fort DPS builds I've tried modeling:
<edit: removed these numbers and reposted a couple posts down, with link to my work>
All sorts of other situational bits are in play, but the bottom line is: these builds are all within 10% of each other, and are all 20%+ ahead of a lot of melee builds vs. fortification. They're all good, but none will be crowned "The King", since none is head-and-shoulders above the others.