I noticed the "10 yard/1 club distance loss" comment as well. Isn't hitting going to produce slightly less distance not because of clubhead speed factors but instead due to hinge action?
Angled hinging has layback and closing, which will mean the clubhead has more loft during the impact interval than horizontal hinging. In addition, there is some 'compression leakage' due to the uncentered motion that angled hinging produces.