Do these create less lift than a regular willowleaf blade? This is what I think from my reading but I am not sure.

 

Allen

Same surface area, same lift but you get a little more vibration out of it. 
 

EDIT 12/31

A few years ago I had read about traits of blades of differing weights and shallower and deeper cups and decided to "experiment" with the idea. I took an Indiana blade and flattened the cup a little and flattened the edges to almost like a French blade. I them put creases in it to almost resemble an Oklahoma blade. 

Unfortunately it was late fall at the time and I usually go in multi species mode so I ended up making an inline out of it instead of and overhead model.

Not sure how old it is and it's been thru a few wars but it's still catching fish:

It is by far the easiest starting inline with more vibration/drag - slower bait than a standard Indiana blade and I didn't experience more lift.  

 

Are the SK burner spinnerbaits shallow cup or something different?

 

Allen 

From what I just read the blades are thinner so they weigh less. 
Less weight = more revolutions = less thump. Little slower than a swim jig but with a lot more flash. 
You may get the same affect if you cup your spinnerbait blades or get deep cup blades. The only drawback is that they are harder to start up depending on your configuration.

Or just flat out downsize the blades and get the same burner affect. 
I wrote a post in here a year or so ago called I believe “Spinnerbait musings” or something like that and talked about all things spinnerbaits