Just because you mentioned 'questioning your technique' (if you meant scope technique)and not because I'm picky

Nothing wrong with yours (technique)..... Nice to see alot of time on the screen

If you wanted to and had another channel

You could shove a probe in the MAP/ MAF sensor as it Is generally an easy connection to make, to see the air leak you made. No real reason to do so in your case though.

Just abit more of a scientific/accurate test and is easier to become familiar with your capture when you come to review your bad and hopefully when you fix it, good capture in months/years to come

Like I say mate, just saying

James