I've used the Ursine chainmace for about 190 venenatis kills. I swear the double accuracy is bugged. Many times i've hit 0's with both specs. The special (in reality) doesn't seem to effect the accuracy at all. Not a huge issue obviously, but we'd all like it to work properly, if it isn't already... I could be delusional I suppose.
I know what you mean I've tried it with my main multiple times and although its still a really fun weapon it definitely needs an accuracy buff on the spec. Support