For me, what is key is my target low-point based on the lie. Usually on ball above feet or uphill lie, I'll set my target low-point where the ball touches the ground (or maybe very, very slightly forward of that); I don't want to take a lot of turf ... worse case, I hit it thin, not fat, and I don't dig into the ground at a weird angle that stops me from following through.
(I got the idea of this from the thread on hardpan, and I think it was Yoda's answer about the low point; I could be wrong ).
On ball below feet or downhill lie, I set my target low-point ahead of the ball to make sure I don't top the ball with a premature upswing follow through.
For ball above feet, should we set up with a open stance, more steep plane since the slope will make the swing more around and will affect the low point?
For ball above feet, should we set up with a open stance, more steep plane since the slope will make the swing more around and will affect the low point?
I think, in the end, you gotta go with what feels right for you.
I haven't heard anyone mention this, so it's probably not the recommended set-up, but I actually set-up with a closed stance in ball-above-feet situations. I feel that the golf ball is pretty close to me, so I set up with the closed stance to help me with my turn, as well as to give myself space for my arms on the downswing. I just mess with the aim and the club face orientation to adjust direction.