also should be noted these engines run at high temperatures, and the pistons are high compression, so if your not using full synthetic like Amsoil or Redline oil, you potentially varnish and sludge up the rings and ring land areas on the pistons. causing poor oil sealing and blow by which might be contributing to the high volume of oil being captured in the catch cans. Definatly replace your PCV's as this is cheap part, they could have weak springs or gunked up with junk thats letting excessive vapor bypas into the cans
there could be a deisgn flaw in the oem PCV, if thats the case, I would gut the factory PCV from the manifold , and run over to autozone and pick up aftermarket PCV for an older 90's truck, something that has hose fittings on both ends, splice this after the factory pcv port and run for a few months