JUICE:
Thanks for the report.
Unless there is absolutely no other way of presentation, it might be best to present your dry fly on a slight angle; a little bit up and across, preferrably down and across with a reach cast or directly across. You should try to set the hook with a slight downstream and side motion. It is hard to do, but if you can pause for a moment before striking, that sometimes helps. I have heard it recommended that you recite a short phrase ("God Save the Queen") before raising the rod and setting the hook. There are times, however, when fish are just plain hard to hook and hold, because they are taking the flies tentatively. This is probably related to weather conditions and fishing pressure. When you have completely fooled a big brown, quite often the dry fly will be lodged deep in to its mouth, this happened to me Saturday on the Farmington. There I was fishing my dries down and across using a 3ft 5X tippet. I hope this helps you.