I think alot of people end up with a slight offset, and get the impression it isn't as bad when the front part of the prop shaft is short going into a centre bearing or reversing box.
Would rather mount it a bit lower. Your car looks great slim I love the chassis colour. It's amazing how similar looking the fireblade engine is to my zx9r, even the rocker cover nuts and clutch cover.
This guy has his zx9 mounted at an angle front to back it is a stuart taylor locosaki the chassis is almost identical. His sump is the otherside of the rail and slightly lower.
You can see here he has an ofset on his prop.
Chris