QTableView columns - can't set small width

I have two QTableView with own simple models. After making the following:

    tv1->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    tv1->verticalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    tv1->setSizeAdjustPolicy(QAbstractScrollArea::AdjustToContents);
    tv1->resizeColumnsToContents();

I have this picture:

And here what I want:

What I've tried:

• making sizehintrole in headerData in my model and return my own size;
• changing setSectionResizeMode to ResizeToContent
• setting every column's width with and without resize modes through "setColumnWidth"
• making my own delegate with sizehint overloading with my wanted size
• setting stylesheet with padding 0px; to QTableView, QTableView::section, QTableView::item
• using "header->setDefaultSectionSize"

Nothing of these works. I am desperate enough to draw the table from zero with QPainter or follow every source file to watch the real size. But before that, I would appreciate for any advice.

You can try setting the minimum section size to zero for the horizontal header, this way:

tv1->horizontalHeader()->setMinimumSectionSize(0);

(Docs here).