Matt,
If the fish your after are above 3lb rather than stay with spade hooks try using eyed hooks with the knotless knot.
Personaly i use hair rigs for around 99% of Feeder/Ledger work and around 50% of Pole work when after Match Carp (which is most of the time).
I've found that with spade end hooks and some of the heavier Hi-Tech lines you will suffer with the line slightly moving causing the spade to cut through the line during the fight or the hair can twist and not come off the hook shank properly.
The hooks i use are Eyed Kamasam Animals and i bend the eye back about 10 degree's so the line runs straight down the back of the shank (if not bent the hook will hang at a bad angle) and tie the Knotless knot.
A small piece of clear pole float rubber slipped over the knot tidies it all up.
Malc
Fish with Friends @ MaggotDrowning.com