Sure, you are right
1) by disabling your template, problem persist - it means, it is problem of VM itself.
2) I just wanted to use standard fields and functionality of VM, when these fields are available. But usage of Custom fields is more convenient and easier, no doubts :-)
Only I have some formating minor issue - look at this for example:
cenzdra.cz/e-shop/bio-potraviny/testoviny-vretena-se-spirulinou-country-life-detail
In product details Im using two custom fields "Vlastnosti" (Properties) and "Balení" (packaging). Last attribute of Vlastnosti is in this case "Bez mleka". Then is name of Baleni custom field. And there is too narrow space between these two lines, just cosmetics issue, but I cant find, where to change this interline space. Do you know, where?