I have to agree with you there. It was hitting over 40W at one point...I ended up getting an inline meter, and even bought a 100W power brick...The highest I got was about 22.5W, and it only intermittently hit that..it probably averaged at 22W at its highest.
I'm sure kernel devs can get it to hit that 30W charge, or very close to it, but would you trust it? I don't know that I would risk damaging the charging circuit, or the battery since Google seems to be unwilling to let us know why it doesn't hit the 30W they fooled us into believing it could hit.
I would think they would have said something by now since they've already released a fix for the fingerprint scanner, and have acknowledged the screen flicker when the phone is off, which somebody claimed was also fixed with the .037 update. I'm not even going to bother checking it since I will never power down my phone and purposefully press the power button in the manner required to make the screen flicker.