The good news is your oil pressure seems very good, for now. If the rocker bushings were installed properly, and there are no signs of looseness then I would start obsessively checking oil filters with a bright light and magnets, and use a relatively short oil change interval going forward and hope that it starts to decrease significantly. The lead/tin are also trending upwards - to me that is the opposite of what I'd expect from an initial break-in period, and seems more suggestive of progressive wearing. by around 185% from the prior oil change.
What's worse is that the copper levels are increasing. I just can't find a definitive source on OUR bearing designs. I am not sure if the LSA has "aluminum" thrust bearings or not - but certainly there are aluminum and polymer components in LS bearing design present-day. LSA main bearings seem to be a mix of copper and lead - except that GM has removed lead from LS engine bearings starting around 2011-2012. Bronze bushings seem to run around 85% copper, 7% tin and 6% lead (generally, with other alloys depending on the specific application and manufacture). The lead and tin is higher but not obscene.
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