Chapeau on making such a leap in distance.

Not surprised you're a bit sore after that though.
Saddles are an incredibly personal thing so are very difficult to recommend. I can't get on with the Charge Spoon already mentioned but do get on with the B17, although it is not perfect, particularly when getting round the 100 mile mark.
I notice that the Brooks Team Pro is popular with the Audax crowd who I presume know what they are doing. As this is designed for use with drop bar bikes would it be of any interest?