Selle Italia SLR Kit Carbonio Flow Saddle not fitting post

Hi Guys.....I recently purchased a rather nice Selle Italia SLR Kit Carbonio Flow Saddle and I'm pulling my hair out trying to fit it correctly to my Trek 2.3 Bontrager seat post....the existing clamps are not gripping the carbon rails correctly (7mm round) and look like, if tightened, they would crush the rails. On looking at a few youtube vids there was one that said this seat must be held by upper and lower clamps??.....well the Bontrager is a 1 bolt seat post, so, on the advice of a well known retailer w.gg.e i was advised that the 'Ritchey Seatpost Clamp' (for 7mm round carbon rails) would fit the post and seat....spooky...it doesn't!...the clamps don't 'marry' up correctly with the Bontrager post clamps and the bolt supplied from Ritchey with the new outer clamps is at least 10mm to short. I suspect this clamp is only for the overpriced (imho) Ritchey seat post...so how do i fit this seat, if possible, to the Bontrager post?....if its not possible can anyone suggest a good seat post to use?