I checked on my chassis/pictures ans also in the book page 46, CP15's should definitely be closest to SW3.
You should place CP15 according the postilion of the steering column going straight into the centre of CP16's cut out, and not the opposite.
I think you tried to have your steering column perfectly centred on the section of TR9 which is between TT12 and TR2. However, your reference shouldn't be this, but the centre of CP16's cut out. CP15's have to me moved closer to the transmission tunnel (or SW3) I think.
Hope that make sense
