Sorry about the delay in answering your question. The sling was already damp from previous fish.
I totally agree with you that perch deserve good handling but equally important and the real reason I wrote the hub was to promote the sunken paternoster idea and the concept of using the lead and the float as a bolt rig effect to reduce the danger of deep hooking perch. Too many books I have read stress a resistance free rig which increases the chances of deep hooking and subsequent damage or death to the fish.
Glad you enjoyed the video and hope you found something you could use in it.