John uses wrist motion, from a slightly supinated arm position. Your arm position looks pretty much the same to me. So I’m not really seeing the “disadvantage” here.
With the arm position you have, you can choose to make a picking motion where only the downstroke escapes. That would be your “upward pickslanting” motion, or what we sometimes call a “2:00” wrist motion. This is what it looks like you are doing around the 20 second mark.
It’s also similar to what Andy James is doing in the thread about him today, which you can find here:
This is a good example of why I think we will eventually we’ll stop using the term “pickslanting” to describe motions. I think it’s probably clearer for most people to look at the motions they are making and understand exactly what they are doing, instead of worrying that they have “too much slant” or something, which is frankly never the way it worked. I know we’re responsible for this confusion so again I apologize - we’re learning to be clearer as we go here.
 
      
     ) is that UWPS includes all picking movements where the upstroke is trapped, while the downstroke escapes the plane of the strings. The “2pm wrist motion” is only one of many options to achieve this result!
 ) is that UWPS includes all picking movements where the upstroke is trapped, while the downstroke escapes the plane of the strings. The “2pm wrist motion” is only one of many options to achieve this result!

 
   - I think that Andy James (a great UWPS player) may use an occasional (or perhaps even systematic?) cheeky pulloff in his (great) cover of this solo - notice the right hand that seems to lift after most of the 10-note chunks, which may indicate the repeated downstroke with pulloff in between. I am not 100% sure but there you go!
 - I think that Andy James (a great UWPS player) may use an occasional (or perhaps even systematic?) cheeky pulloff in his (great) cover of this solo - notice the right hand that seems to lift after most of the 10-note chunks, which may indicate the repeated downstroke with pulloff in between. I am not 100% sure but there you go! 
   - do you usually try to pick all the notes or use the AJ pull-off strategy?
 - do you usually try to pick all the notes or use the AJ pull-off strategy?