Sum
In our case by lowering the instant center their is less hit to the tires, or less shock.The light springs do the same thing. If landspeed racers ever read Carroll Smith's book they would get a lot of ideas on wheelspin and how to control it. Most of the problems are wheel rates to high. worse case, solid suspension which he says the wheel rates go to infinity.His book is on roadracing but the principles are the same.
Years ago freinds of mine had a modified roadster with wheelspin problems, by scaling the chassis [directions out of Alston book] we could see that they were really planting the tires.In their case a simple fix was to drill bolt holes higher in the top foward brackets,this solved the problem. Engine in roadster is 1925 chev 4cyl. As carroll Smith says don't equate wheelspin with hp.
Any how a 4link allows the instant center to be set at a longer and lower spot than a latter bar are other systems.
hope this helps.
JL222
ps if you ever get a chance to push down on a sprint cars rear supension
you would be amazed at how soft it is.