shocks on a stock suspension

so it seems the new fad in shocks on a stock suspension, imca southern sport mod, is the tie down on rf and high compression on the lr (6-8 range)

what gives? my idea was since these cars have no lift on the rear, the idea was the get the weight off the rf on to the lr.
is it worth sacrificing forward drive for the momentum gained running a tie down rf?
or is it something to do with having the LL trailing arm pointed uphill due to the car rocked over, the arm angle adds drive?

Look at the atached 2014 QA1 Shock chart and it has a "starting point" recommendation and you are right that seems to be the new trend...tie down the r/front and jack up the L/rear