We run a reverse split in the DLM...Tightens the car up going in and helps pin the RF down to keep the LR up on the bars easier...Anywhere from 150-50 lbs depending...

In my opinion and experience, it's not a big deal to have reverse split or not. Front end geometry, roll center & height , and where it migrates to is controlled partially by spring rates when you look at body roll or dive on corner entry. With a completely fab front end like a late model these things are built in and or adjustable so you can run the car at different attitudes. Control arm length and mounting location determine where the geometry can go , the springs determine how far it will travel through it's range.
If you simply soften the right front spring the car will be more tight off the gas, and more free on the gas. If you stiffen the left front spring it will tighten entry off the gas as it will hold more weight on the rr on entry and the middle and exit will not be much different as weight is coming off the spring .
A softer spring stores more energy and will transfer more weight if it can rebound.
This is just my thoughts and what we have learned and applied. We have run split , even , reverse , and had success with all of it. Just remember your not just changing spring rates and chassis manufactures usually have spring recommendations for this reason.
Hope it helps. Good luck.

thanks for all the good info on here.  Bobby thanks for explaining all that info that is really helpful and with your results i know you know what you are talking about.

on our prostock/ss car we just switch to 900/950 spring rate in the front with the RF heavier.  We have gone lighter on RF spring and it seems to have to much roll.  But at smaller tracks that dry out its fine because we need that roll to get side bite in the car. On larger track such as we run for our home track its a little tacky at the beginning of the night and starts to slick off in the main but we carry alot more speed into the corners so we run a stiffer RF spring.  

"heavy spring get the weight" with this term more weight will transfer to the RF spring with it being the heaviest?  So if you run a reverse setup more wieght transfer to the LF?  So just softening one or the other might hurt the set up other then helping what you are trying to achive at times.  Hope i am explaining this right from what i understand.

I want to try a reverse spring set up on a hobby stock car that am helping a friends with its a 3400 lbs metric car all stock. The car is loose mid to exit with not foward drive.  I was thinking this setup might help because their are not alot of different way to adjust these cars other then stagger, offset, and maybe shocks.  The car front springs right now is LF 1050 RF1200 which is a big split and seems stiff. Does anyone thing a reverse split of LF 950 and RF 850 to light or should it be something more like LF1050 RF 950?

Thanks for the all the help everyone.