So finally found time to include the proposed changes, had some stuff (both health and otherwise) going on, which is why it took me a little longer than anticipated. Luckily, the stylesheet shouldn't be bothering us any longer, as it seems to have been cleansed of any mistakes, which (could) have lead to issues down the line.
However, I'm still not completely fine with how the site looks now, especially in regards to readability. Even with font-color black, some of the text is barely readable at this font-weight/thickness. Tried multiple solutions, non of them improved readability other than massively increasing the thickness (to the point we started out from). Maybe using a different font might be an option... Will look into some.
Will now start optimizing/fixing the html part of the site, as, if this is going to be used as I'm pressuming that isn't going to be flawless either.
Have a nice day,