I too had only band 41 on the IgG positive and none on the IgM with my first Western blot even though I was positive for Anaplasma and Myco. I was bitten twice and really knew I had Lyme regardless of the test results but decided to do a WB through IGenex just to confirm.
Lo and behold I came up positive for many Lyme-specific bands on the IgM where I had none through other labs. My antibody score was 1.01 which is equivocal so obviously that's a very unreliable test for diagnosing Lyme.
I would suggest the IGenex Western Blot if you really want a confirmation though you may not even get a clear answer as it all depends on the immune sysytem and its reaction to the bacteria. The general rule is the sicker you are the less likely it is to show up on the WB.
That may have some validity as my symptoms are pretty mild compared to most yet had a very clear positive test through the only lab I would ever trust to diagnose Lyme.