Thanks for the feedback. For anyoone else who follows this thread for an answer.
I have conocluded that the inhaul is used in conjunction with the downhaul to create risistance to rotation while the boat has a positive rotation device. The factory install for the inhaul proved inefective and agricultural and I have improved this hugely with an RF5 and a cheek block and shock cord.
Complicated versions of the positive rotation are useless and just mess up the tramp but I have led the simple version back to a clam cleat on iside gunnel at front of dagger board. cheers.