Hunter,
The best you can achieve is to break down a protein mix that caters for all amino requirements in a carp, you get attraction on the most basic level (they cannot ignore it) plus you get the perfect nutritional profile. This is VERY, VERY difficult and requires an understanding of certain chemical reactions I have not got my head fully around... it is DEEP to put it in a simple way.. LOL

I am working on it, but am not totally there.. yet..

"Is it a case of high attract at loss of nutrition or about as good a compromise as we can get between the 2 at present"
The contributions by Les Watts on attractor leakage in the latest BCSG book (Rotary Letter 2) should be required reading for all those who make bait, it explains what you are thinking about 'attractor' loss. It will conversly put you onto a different train of thought if your mind is that way inclined....

However, substitute a boilie for a dissolving bait and it all reverses...

But... dissolving baits present their own special problems....

High attract is a nebulous concept, 'attract' means they get a feeding reaction to the signal in the case of a carp. 'Attractors' are well documented for carp and most on the market do not fall into that definition.