Kittyboy, are you running a pickup brace? I guess it's also good to check the O ring (correct o ring, not pinched on installation) although everything I have heard about the O rings seem to indicate oil pressure would be VERY low if it were the incorrect size or damaged.
Hey SSandman, I also installed an Improved Racing oil pan baffle, ICT pickup tube brace with Melling brand 'black' color O-ring, stock CTS-V2 oil pan. Figured it can't hurt having a pickup tube brace and baffle installed. I found the extra 3mm diameter 'black' Melling O-ring fit a bit more snug on my tube than the OEM GM 'blue' color.
Checked some logs, appears 30-34psi 850rpm idle pressure, 45ish psi cruise, 50-59psi WOT using Mobile1 10w40. The pressure seems to follow the old NA rule 10psi per 1000rpm with 10w40, not that it's critical, but I felt that it would give me a bit more buffer on the bearings at WOT. Prior using 5w30 Moble1 I would see 42-48psi WOT. I recall slight pressure drop using 5w30 at 5600rpm at 200* engine temps, idle would also drop into the high 20s.
Since using the 10w40 I have not logged oil pressure drops at WOT for what it's worth. I am going to run the current oil 3k then get an oil report before changing, I'll follow up with you the results. I am attaching a PDF of my 500, 1000, 2000 mile oil reports using 5w30 Mobile1.
You are correct GM lists 6500rpm max for B15, it was the 6665 pump I was referring too. I'm still a bit concerned about cavitation with the stock B15 pump exceeding 6200rpm from what I've read. Also realizing different flow/pressure requirements for 'priority main' blocks.
I live in WA where the air is ideal for making power. However, I'm running 92 so my spark advance is on the lower side at WOT 14-16*. I run rich in order to advance the timing a bit 10.5AFR keeping the exhaust heat cooler. In the future I'm going to consider some boost additives to see if I can advance a bit more without knock.
Have you borescope your engine yet? I have a couple cylinders and have some images.