Got the new display delivered by FedEX just now!
Plugged it in.
Looks a million times better than the last one!
There seems to have been some timing differences between the two so at the moment there's a lot of ghosting going on (this display is probably faster than the old) so I will need to tweak the code a little.
Starting of to be a great day!
Turns out it was the logic level converter that was the problem. The old display required +5V logic levels while the new one only require +3.3V, thus rendering the converter obsolete.
Even worse so - it kept a slight current residue on all pins and blurred the display.
I bypassed it and now it looks rather nice! :D
It seems I still got a bit of ghosting going on. Above each lit pixel is a dimly lit ghostpixel. I'm investigating this now and it is really bothering me. To be continued.