I would definitely go with the Slam Specialties then. Since they deliver more force per PSI you can run less PSI per stroke height which makes for a softer ride.
Another big factor that determins the ride is bag placement. In the front you're limited to where you can mount the bag but in the rear a bag over bar set up will always be a softer ride than a bag over axle type one.
Please let us know if you have any other questions we can help with!