Saddle angle/tilt

Just got a Selle Italia SLR superflow and trying to get the setup just right, on their website they say it must be set up level but confusing when the tail kicks up 3-5deg and the front also has a bit of a wave. Should I try and get level across the whole length or just the front half??

I do level across the whole length with my selle italia flite saddles, and then if it feels weird I’ll angle the nose down a touch :slight_smile: