I started development of my C# code before I knew about those posts.

Also the procedure in the first post that describes how to get the data into the Zorro format is rather involved. It talks about stratquant, cygwin, python and some other conversion scipts. According to the documentation the T1 data with variable spread can also only be used with Zorro S.

The C# code does all in one go without the need for additional tools and the generated .bar data with variable spread can also be used with Zorro Free. This is the improvement someone might be interested in.