that was also my only real issue with the corbin seat as Kenny said. it moved me slightly forward and honestly lower another inch as well IMO. which being tall did not help. my butt felt great in the seat.. but knees didn't like it so much.
I'm also currently having the stock seat redone at a shop. I priced at 4 different shops, and while I didn't chose the cheapest one, I went with the one who asked me the most questions about what i want, and spent the most time listening to me.
Will post pix once I get it back
2017 Honda Rebel 500
2018 KTM Duke 390