The real answer is....you can't. Unless you manage to find a decent print somewhere, somehow.
The public domian ones are obviously going to be of questionable quality, but the Turner prints are not much better honestly.
However, Steve Stanchfield did scan a pretty nice print of "Insect to Injury" a while back, but I don't remember if he did any other 50's Popeyes.
Honestly your best bet is to try and wait for a potential 50's continuation of the Warner Archive sets, hopefully when this whole virus stuff is all behind us. Until then, you're just gonna have to bear with the crappy copies out there.