Hmmm. Ok, your boobs are pretty much the exact opposite of mine so I'm about to suggest all the bras that don't suit me (close set, fuller on top, and seem to have become narrower rooted to!)
Curvy kate - as a rule, this brand is wide wired. Their lightly padded/moulded bras are very soft inside - the smoothie, tease me, thrill me and sister styles might work well for you. They have a sort of cottony lining that makes them very nice to wear. They tend to run slightly looser in the band, and a wee bit small in the cup.
Bravissimo own brand - anything half cup style should work well eg mademoiselle, fanciful.....
Freya and Fantasie (sister companies) - as a rule, freya wires are also pretty wide. Fantasie are a little more mature, but can be very soft (I find the shapes on freya and fantasie are a wee bit matronly on me as they push my boobs further to the side than they sit naturally so these might work for you). Something like the Freya Totally Tartan or Hello DOlly should be quite soft, their non-lacey bras generally are.
Tutti rouge is also reputed to be very wide although I haven't tried it myself.
I suspect unpadded cleo bras will be too narrow for you however you might want to consider the cleo maddie and juna. These were awful on my shape wise however both were nice and soft and juna especially is well loved on here.
Have a look on the Bravissimo and brastop website for starters (they stock a good range, you can always hunt em down cheaper elsewhere if necessary!) and post up any you aren't sure of. I think between us Sorrel and I have tried almost every bra going (or maybe it just feels like that!)