Thanks for your insights NEBC. I have been fortunate to be catching 95% of the fish on the surface. It has been really hard to take. It the fish are not very busy on the surface they are still cruising at about 4 feet and will come up if enticed correctly. I did spend a day using the clear line just under the surface and it was very effective. I will try some 1730's out (catching 15 lbers sounds like a horrible thing to do). I haven't had to use the sinking line yet, but your theory for fly travel sounds like an effective way to get some bites.
Cheers, Rob