Custom bike to offer smoothest possible ride on bad roads So, I am in a peculiar situation - due to an injury, shaking in any direction leads to pain and my condition is improving very slowly. I'm looking to find/customize a bike so that it offers me the smoothest possible ride on the unfortunately poorly maintained roads in my city.

Today I have a Cirrus Cycles suspension seat post and low pressure on my tires (which I also exchanged for fatter ones) and that helps to an extent, but my current bike is a hybrid with no suspension.

I think that a full-suspension bike would greatly help, but wonder what I have to look for to make sure I can tune it to smooth out road irregularities as opposed to the harsh falls of mountain biking.

Do you have recommendations as to what kinds of bikes or kinds of shocks I should be looking for? Or anything else? Thanks!

edit from comments:
First the road conditions. The following types of irregularities exist:


concrete slab roads where over time slabs have settled at varying heights. sometimes the change in elevation from slab to slab is as much as 2-3 inches, which is similar to falling off a small curb. 
potholes and cracks in the pavement with a depth of up to 4 inches as well. some are avoidable, some are not. 
gradual dips in asphalt road surface - sometimes parts of the road sink without an abrupt edge, like a soft pothole 
raised linear sections caused by tree roots under asphalt pavement
Based on your requirements I would say full suspension fat bike
A few manufactures make them   

 

That bike is $6500 retail but you did not state a budget 

Not worth switching out tires as they are expensive but when you wear them out go with more street (will less knobby) tires   

If you are on a budget I think I would go with lower end fat bike before a full suspension.  But I am not saying full suspension would be wrong.  

I know I usually post a Salsa if I post a bike but I am not associated with Salsa.  I own 2 and it is a brand I am familiar with.