What are your strategies with HARD Comparative RC Passages? Help?

Hello everyone!

How do y'all attack these passages? When my comparative is an 'easier passage', I usually do -3 on my RC section, but I've had two of these HARD comparative passages kill my score to -5/-6 on two different occasions.

Powerscore noted that these type of passages are frequently the 'harder one' nowadays, so I want to be ready for my test. I have noticed several of the questions in these passages tend to reference the passage as a whole rather than a specific paragraph/view/etc.

This is an example of the type that I am talking about:

LSAT 76, RC Passage 4, Negative Evidence (Comparative)

Any help would be very much appreciated.