This feels like a dumb question, but is the text rendering really dark for others in iTerm2? It seems like on a black background I cannot get pure white text. It’s always a middle shade of gray for me - before and after getting a Retina display.
I have messed with the colors and text rendering for literal hours over the last ten years and I genuinely cannot get it as clear and readable as Terminal.app which is a big part of the reason I always end up falling back to Terminal