There is nothing more important in suspension set up than understanding your
tyres and how to get them working in their optimum range for the track and conditions.

When Garth Tander was asked in an interview what his learning curve had been like in V8 Supercars, the first thing he spoke about was learning to qualify on green tyres.

In some classes of amateur racing, you have no suspension adjustments, so after your workshop set-up, tyres are your only tuning adjustment at the track.

http://www.turnfast.com   have an excellent article on track tuning with tyres -
pressures, temperatures, the the keeping of records and finding out in what
ranges of temperature and pressure the tyres will work.  Look for the "Tires"
article in their handling section.

The only thing that is mis-leading is the bit about being able to sense the difference in tyre pressure of 1 to 2 lbs in the 35 -40 psi range, on road tyres.  I doubt it.  Also, they say lower pressure for more grip at the end that needs it to balance the car.  This could be a typo, because of course you increase pressure (relative to the other end of the car) for more grip on all road tyres 60 series and higher.  Always ensure that pressures at both ends of the car are within the working range of the tyres you're using.  On all low profile tyres and racing tyres
we recommend using other ways of balancing the car, and to run tyres at the
optimum pressure that you have determined through testing.

Testing the Baseline Set Up for More Speed

Please have a plan when you go testing.  At least then, if you decide to go in
another direction during the test, there should be good reason for it.  Demand
consistency and good speed from the Driver.

Record, record, record.  And try and work out why a change is faster (or slower
or no different.)  This is why we think it is so important to develop your own "mindset" for analysing suspension set up problems.  Our thoughts on this are here.