On the Lower Itchen Fishery I use barbless Kamasan Animal hooks in sizes 16 and 18. I don't know if barbed or barbless are better for grayling, but the barbless seem to make a lively fish much easier to unhook.
One of the reasons that we suffer many hook pulls with the 'lady' may be that our rods are too soft. On previous grayling sessions at this fishery I used to lose a lot of fish using a through actioned 13ft match rod. I also found I could do very little with a good sized fish because of the speed of the current. The rod just bent and flexed at will, until it would spring back as the fish escaped. Out of sheer frustration I stepped up to a 12ft 1.25tc Avon style rod. I use this with 4lb main line to a 2lb hooklink (old style not hi-tech!) and a 1 swan Drennan Chubber float.
I now lose very few grayling and get good fish in the net in a fraction of the time it would have taken me with my old set up. FM members from the last 2 fish ins on this water will vouch that it works for me with several grayling over 2lbs and plenty just under. It also works well for the big rogue trout and bonus chub. I suppose the ideal tool would be one of the power match rods that are available these days.
Re fine wire hooks for roach. I swear by kamasan B511 hooks for small roach up to 1.8 (Perfect for you Steve!!) and for larger roach I use the Kamasan B611. Both of these hooks are micro barbed. On barbless only waters I use the Mustad Wide Gape Power Barbless. None of these hooks has let me down, but you have to be careful with the 511. It's a very delicate hook and can bend easily.
For larger baits such as flake, or when bolt rigging for roach, I use the Drennan Carbon Specimen. Again, this hook has landed plenty of big fish and has never let me down. I can hardly remember losing a big roach on this pattern of hook.