>I would like to profile the various methods in this object to see where the object could use some modification. When I place a set coverage to extinv.txt in the calling program I'm not getting any information in the coverage tool about the methods though I can see the various methods in the text file. Any helpful hints would be appreciated.

Have you tried adding markus Egger's MaxCov? I have no idea if this'll give you any help here, but it's the first thing I'd look at.