Post rebuild oil consumption and oil analysis

I'm bringing my truck back to the shop that did it's rebuild and would like to know how firm I should be about warranty and where to look first for the issues I'll describe. Rebuild was done 45,000 miles ago and oil consumption seems far too excessive. From the beginning it was greater than normal but I thought maybe it was just breaking in. Now it seems worse, I am down to the "add" point of the hash marks only 6,000 miles after changing my oil. I've put a whole quart in during a week of driving after that. I'm also noticing more frequent regens and 2 oil analysis since have shown warnings for elevated Lead levels. I will include the oil analysis for review. The meter on the oil analysis is done in Kilometers so 10,000 kms was when I first tested fine at 6 ppm then at 16,000 kms I tested again and got 20 ppm.
I will also include my prior oil analysis results that were done through CAT. The Red is when I rebuilt my engine.

 

Yeah I've been telling myself to let it break in but after no improvement after 75,000 kms and possibly worsening I'm beginning to get worried haha I've changed it 5 times during that period. 1st time at 5000 kms just to clear any possible contaminants and then I had 1 interval make it to 30,000 kms but every one after I start consuming so much oil I've been changing it at 16-18k kms in hopes that it will last longer the next time. Consumption is manageable until 10,000 kms it really begins to accelerate afterwards

 

Thanks for the response! What about a quart of oil in 1500 miles? Because that's about what I added last time after 6000 miles it really accelerates it's consumption. I might not care as much if I didn't have this DPF but I think it's plugging it up because I'm getting frequent regens now. I suspect the shop idled it too much after its rebuild because they had it an extra 2 days to resolve a fuel issue they were tinkering with. I found they did a Regen on it during that time too. But as soon as I got the truck I did all I could to properly break it in by varying my rpms, 0 idle time, and pulling 80,000 lbs GVW up and down the hills from New Brunswick Canada down to Pennsylvania and then up again with 60,000 lbs GVW so I thought that would do it haha

 

Yeah I'm sad I missed the glory days of trucking before all these new standards lol thanks for the insight I'll update what the shop ends up telling me. I want them to borescope for glazing. I went with an aftermarket rebuild kit because Cummins was 25,000 CAD more and I didn't have enough credit to fund that although I might be regretting it now.