CBV is new as well, but I did double check for leaks recently. I'm totally stumped too - I almost wish I had a CEL so I could have some direction. Thanks for the recommendation - will do!

No recent work, no. Just out of nowhere. The reason I'm not currently suspecting a boost leak is because I know it's capable of boosting to 7psi with the wastegate hose undone, but when it is hooked up, the ECU or something is causing the TCV to limit it to 3psi. In my (very amateur) opinion, to me ...

This issue started out at as only getting 2psi (per aftermarket gauge) when boosting, but when pulling the hose to the wastegate, I could get up 7-8psi, albeit it was somewhat stuttery and not smooth. This being the case, I opted for a Pierburg TCV to replace the stock one - no change. I went ahead ...