Hawk , you sound like a very knowledgable gentleman , helped by years of experience no doubt .
Can i take it by "general rule of thumb" with regards to hair length , you mean as a starting point and then shorten or lengthen the hair accordingly accordingly to how your session is going etc ?
Or do you stick to your guidelines rigidly come what may ?
Reason i ask is that , in my relatively limited experience , no two carp feed the same way and i certainly couldnt predict it .
Unless of course i'd been stalking the same target fish for a considerable period of time of course in which case i may have caught on