Therefor by wearing these the WS gains .8 to it's total fTP.
But this is still a weakness, because the subsequent hits are still less than 1.0 which all other multi-hit weapon skills have. In order for this characteristic (propgation of fTP) to be viewable as a benefit and not a nerfing mechanism, the fTP value would have to be at least 0.9 (which would make the fTP 1.0 on all hits when wearing a gorget).

TL;DR: The propogation of the fTP value to all hits is to limit the weaponskill's power, not enhance it. These weaponskills would be more powerful overall if the fTP was only different on the first hit.