So the method of setting all of my insulation thicknesses to zero has resloved the issue of the misplaced tap, however the weight of the object is no longer correctly calculated. 

I had to make a new type of insulation to represent each size so they weren't mixed up, I am happy with that as I have already purged all the irrelevant Autodesk prepopulated products and specifications. Sorry Autodesk, that content was irrelevant to me!

I am still hoping to hear from someone if they have a more reliable solution.