Hi Make,
Ahhhh brings me back to my harefield & Savay days!!!
Spent some time fishing the tops of the bars then and i went with the following,
Flat inlines or pear leads ( have a look at the atomic tackle gripper leads)
With regards to bait, chops are good but we used to make a paste up, boil up blocks of it then chop into squares.... worked a treat plus with the squares you can mould them into a block and caty them out.
Couple of question though mike? how big it the top of the bar? if its narrow then you will never get bait on there.... we used bright pop ups, popped up a couple of inches as the fished used the bars like roads and travelled on top but (as listed above they feed heavy at the bottom)
Can you place a bait or do you have to cast?
What about line lay between the rod tips and the bar?
Hope it helps mate
