Spring mixing

How do all. After some help regarding mixing springs. At the moment I have a medium duty Terrafirma +2" lift kit (shocks and springs) fitted but absolutely hate the ride quality especially when green laning. The ride is just too hard and gets very uncomfortable after a few hours. My plan is to fit a winch when funds allow, so thinking that the mediums would best be left on the front, but would it hurt to change the rears to a softer spring or would it bugger the ride/handling up even more??
Also, would I be best to go for the terrafirma light duty or is there another brand that I would be best fitting?? Anyone have any comparisons of the TF mediums compared to the lights??
Last question!! Which springs are more recommended for off road use - mediums or light duty?? Is there any downsides to either??

Cheers

According to the terrafirma catalog with a winch fitted you need mediums on the front , but standard on the rear unless you carry anything heavy in which case you need to go stiffer

Oh I put progressive springs on mine from extreme 4x4. They have been a revelation in terms of ride quality on and off road!