I don’t think the OCR is ever going to be able to read this font reliably. If you can change the font used by this window without invalidating your tests, you should have better luck. The main problem is that the letter shapes are not very distinct. For example the letter A in this font has a rounded shape that is more commonly associated with the structurally similar letter R. Similarly, the letter V is rounded like a U, and the W really just looks like a U with a thick bottom (see attached zoomed image).
Setting the contrast isn’t doing anything because you already have almost maximum contrast, i.e., white on black. There aren’t any pixels to nudge one way or another.
PLEASE be aware that the OCR is an interpretive algorithm – it’s seeing shapes in a cloud of pixels and trying to make those shapes into letters. There is no letter to “just read” – there are a whole bunch of pixels of one color splattered with some pixels of another color (or more generally, colors) and there are a bunch of heuristics that are used to determine whether there are any words there. It tries to use context to resolve uncertainties, but when what is being asked to read isn’t actual words, there is no context.