Yes, the seat can be a little tiresome, especially on a long journey.
The earlier seats were really uncomfortable, they improved slightly in 2016.
First time I did a seven hour trip i realised that i had to do something about the seat.
I looked around for a second hand one but they seemed to get snapped up quickly, especially the Kawasaki gel ones.
I went to Andy Swan, from arse customer seats near Bournemouth Airport. (yes i know..)
I am very pleased with the results, lot easier on the wallet than the better known branded ones, and now i can ride the bike until its time to fill up the tank without a problem.
Could you provide as link to the risers you got?
Good luck with the bike