Comparing the Heavy Lifts

The USAWA rulebook has (5) Heavy Lifts:

Back Lift

Hand & Thigh Lift

Harness Lift

Hip Lift

Neck Lift

At first I thought they were considered the heavy lifts, because they all utilized a special lift bar.  But then you have a lot of "Special Equipment" lifts that also use the heavy lift bar.  

Then I thought it was the most weight lifted, but the presence of the Neck Lift throws that out the window.

But I digress.  I have the most experience with the Hip Lift and wanted to use that as a comparison for the other heavy lifts.  How do the other lifts stack up?  The Back Lift is kind of tricky because it has only been contested at Dino Gym or Clark's Championship Gym.  I am assuming that the equipment might make a difference.

The Harness Lift seems to be about 130% of the Hip Lift 

The Hand & Thigh seems to be about 70% of the Hip Lift

The Neck Lift seems to be about 30% of the Hip Lift

The Back Lift seems to be about 115% of the Hip Lift