Originally Posted by iacas
Diagonal Sweetspot Path is mostly about the downswing. Get to a position at A4 to A4.5 (see the link in my signature if these terms are new to you) that allows you to deliver the club on a proper diagonal sweetspot path and no 5SK instructor will care too much about what happened on the backswing.
This is a subject close to my golfing heart. For the last couple of months, I've got my swing to the point where I'm delivering the clubhead pretty much down the shaft plane into impact, despite a backswing that takes the clubhead back under that plane.
Originally, my teacher and I agreed to leave well alone - on the basis that the downswing and impact is what matters.
However, my ballstriking hasn't been quite what we'd hoped for - and it now looks as though I might be more consistent with a backswing plane that is a bit more upright and corresponds more closely to the delivery plane.
Now, I'd be the first to admit that ball-flight inconsistencies must be the result of downswing inconsistencies. But for me, the key to a more consistent downswing is looking to be a better backswing plane.