The factory lax rear cover o ring setup is pretty bad. What are my options to do something ettwr there?

It works quite well when properly installed. Rear cover leakage is not that common...

Apparently not as I have seen other posts talking about if also. If you don’t know thats ok.

Make certain that you've clearanced the head of the allen plug so that it dosen't interfere with the rear cover mating to the block. Here's a tip....When replacing that tiny thin *** rubber gasket seal always apply either Permatex 80697 or 80065. This works well to keep the rubber seal in place when installing the rear cover back to the engine.

I don't know if any aftermarket cover, because as said if the gasket is replaced properly, and the cover is aligned, it doesn't leak. There may be a few people who complain about it, but there's a entire Facebook group dedicated to "Sloppy", so I'd guess, they are on there. Nothing wrong with that, just consider the source before saying it's a problem.

Here you go

They suck no matter what anyone says

if someone built one with a legit oring seal I’d buy it