Stitching Critique and Advice welcome

[Hildebrand]

I put this in the "Show me the backside of you holster sewn with a Boss" thread but it is a pretty old thread and hasn't gotten any responses.

I am attaching pictures of a magazine pouch I made this weekend, thanks JLS Leather for the pattern.  I have spent about 3 years in a love hate relationship with the used Boss I bought.  A few weeks ago I finally narrowed down what I think was the problem all along, a bent piece in the needle carrier assembly.  I have slowly been doing more sewing getting confidence in the machine and going through the learning curve.  One thing I have found is the colored thread, I have black and brown, is much more difficult to get correct tensions with and make good stitches.  I double checked and all 3 are the same 277 thread and nylon.  Is this common or did I possibly get bad spools of black and brown, they are very stiff compared to the white.  Anyway with all that said all advice welcome on the stitching of the mag pouch.

Todd