Hi there!
Well, I really don't know if my plugin can fix that, this is probably something related to these plugins that does "show text as image". I understand that you got my plugin in a hope that my plugin would fix that. But can't promise you anything.
1) Probably, what is going on is that the plugin that show text as image, when he creates the image, it is applying the blurry/smooth. So first thing is, tell me what plugin you are using for this feature and send the link here to me. It will be better if it is a free one, so I can take a look at the code and maybe find a solution.
2) As an alternative, on my plugin, try to mess with the plugin parameter for smooth the font. I think you should set it to false.
3) Maybe using my Pixel Perfect plugin(It's free) would also solve that. But I don't know if your game is pixelated at this point. Because that alternative will set the pixel perfect (remove any smooth/blurry) from everything. Of course, if you are using other pixel perfect plugin, disable it. Leave only mine enabled.
Hakuen Studio Pixel Perfect for RPG Maker MZ by Hakuen Studio
4) On theory, the zoom plugin would not mess with anything, since your zoom is at 2x... but I think it is a risky move to try to aim for a pixel perfect game. Anyway, try those alternative above and let me know what exactly moves you tried if you manage or not to fix the issue.
5) Another problem is, when using the show text as image, is the size of that image. For a font to be pixel perfect, it need to raise it's size by integers: 2x, 4x, etc... If the show text as image plugin is resizing the font with 1.7x, 1.5x, it will not look good. My advise would be create another font with the proper size you want. And then(after I take a look into the plugin), make the plugin uses that resized font.