It was probably using similar information as the HH page. I certainly have read that a hundred times or so, along with a thousand posts on cutting blades. I did cut one set of blades with a cut recommended on the ikarus board. It was a mild cut, but proved to me that I could do it, and that there was improved performance ot be found. So I got 3 sets of blades, and I cut more. I cut each set differently and ocmpared results. I cut until the heli would not lift, and then I put on a bigger pinion. Then I cut some more.
I never did care for the DD tail though. Too much buzzing. Distracted me. Went back to mildly cut lbades and the geared tail. I un-mothed it.