Suplex front is tried and tested , loved by some , disliked by others. Try a car that is fitted with the system and decide for yourself.
The rear is more of a complex issue. It is well known that Suplex are working on a solution , but although a development car is using an experimental setup , they are not really close to commercialising yet.
Coil over shocks may work, but you will be on your own working with spring rates and shock absorber settings , so it would be a question of trial and error, and you could end up spending a lot of time and money.
Just removing one leaf from the rear springs is really not sensible unless you know the start point , and the end point that you are trying to achieve. Many +8 racers removed one leaf from the 6 leaf set up, but that is a known system and the data is available to set the shock absorbers to match. Removing a leaf from the latest 4 leaf set up (which I assume your +4 has?) will not give you the same results.
Yes you could very well be right ! The chap I spoke to was racing a plus 8 so that's where he was coming from , my car has 5 leaf spring set up and adj shocks all round but the back particularly is very hard on anything but decent roads and can be very tiring to drive on these as you have to slow down as well !
