I am a little late on this but I just installed the Dobinsons leaf springson my 79 fj40. I wanted a softer ride as well and I liked the fact that these only advertised a slight lift.
They are almost identical to the stock springs in appearance. And once I installed them the lift was less than an inch (which is less than advertised) Also they used the stock shackles and bushings which saves some $$s as well.
The ride is pretty smooth and soft to me but I had some 40 year old oems that had an inside down u shape to them on before so everything would probably feel softer.
These are on eBay for a pretty reasonable price and delivery was free.
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