Rear suspension stiff. Anyone do anything to soften a little?

[t76turbo]

I have a Mcgaughy kit on my 2016 rcsb.  Dont know the part number the previous owner used but it has spindles, struts/springs, rear flip kit with their multi position hanger and rear shocks. Looks like it comes out to a 4/6 drop.  It was 4.5/6 but I ended up adding a 1/2 inch of lift to the front because it was a little too low and had more of a rake than I wanted.  The rear just has the flip kit with their hanger.

 

The suspension is a little stiff all the way around.  But especially the rear.  Not sure if it is the leaf or shock or both.

 

Anyone made changes to a basic setup like mine to gain a softer ride.  Primarily in the rear.  I was thinking maybe taking a leaf out of the rear (the overload maybe?).  Or would it need to be replaced altogether?

 

Any other advice is welcome.

[1SLOW1500]

Ok about same as I have. and I would look at shocks first. You didn't say it had drop shocks or relocation brackets. I removed my overload leaf and added a rear help bag. Worlds of difference. I run just enough air that the back doesn't lift  and have stock mount and bumper removed then the small belltech bump stop. 

Oh is the stop removed? It would need to be but I have seen many trucks riding on bump stop. so I ask. 

[t76turbo]

Looks to be relocation brackets.  But they are mcgaughys shocks too.  Not sure if they are stock length or shorter.

 

The previous owner had NOT removed the bump stop brackets.  They took the rubber stops off and left metal brackets.  At least the professional shop in south florida he had do the drop didnt remove it.  But I did.  (they also never reinstalled the rearmost 4 bed bolts which was causing a ton of rattles.  Took me a while to figure that one out. Dont know why they removed them in the first place)