I have always done mine based on weight. For the boil I add 1 gram for a 6g batch and the mash amount varies by the amount of strike water. It looks like in the mash I am using 0.1g/G. This is what I have used from the start so at some point it must be what was suggested.
Are you still using it in the strike water as a part of the trifecta and then mixed with water for the boil addition? I know there was some "clarity talk" (neddles seemed to run into clarity issues, IIRC) but I'm still using it according to the instructions we originally saw.