Boults,
Nice to see that you are thinking your way into your fishing. (thats not a sarcastic remark, just that not enough people try to think their way around a problem before diving straight onto the local source of "free" knowledge)
I see what you are saying, but the hair length need not be short and the bait tight to the hook with Shrink Tubing. That is just the way that the majority of people are fishing at the moment. If you look at my other rigs on the Sticky, you can see that I change the hair length dependant on my findings
The Rig I have pictured is one I have been using with a 15mm Boilie on the hair; When the Bait is on the hair it actually comes to just past the Loop Knot, so I have a longer hair than standard (or different to other anglers). When I get to a New Water I tend to find out what has been used before and then go on from that. If the water is lightly fished then I have a very short hair, the bait almost "shank mounted" (tight to the back of the hook on a short hair), then as I check hookholds and possible dropped runs etc I lengthen the hair and or the hooklink.
In the same way a poor hookhold can be caused by too short a hooklength, the hook and bait is prevented from going into the Carp's mouth because the hooklink (hooklength) is not long enough. This too short a hooklink can be responsible for not getting a good hookhold, or even for not getting takes or a series of individual bleeps that don't develop.
If you look at your hookholds when you land a fish and even on lost fish you can decide whether your rig is right. If the hook is embedded firmly at the back of the bottom lip, then your rig is just about perfect. If its close to the front or you are losing fish then the hook may be pr1cking the fish too early. If the Carp is hooked at the back of the mouth then the rig may be too long.
Top advice once again, that post even got me thinking about my own set up which i will play about with later today when i make some more rigs for next weekend.