BetterSnapTool - Maximizing windows

I just purchased BetterSnapTool for mac. I need the ability to maximize current window to the next monitor - which was a feature that BST would provide.
However, the window isn't really maximized (like clicking the green maximize button in mac-windows). The result is a smal (couple of pixels) white line in the top of the windows. So, it's almost maximized, but not quite.
Is this by design or is it possible to get it fully maximized with this tool? In my use case I really need it to be fully maximized.

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