We use a 5 turn nail knot with a 3 foot piece of 25 lb. test mono to the fly line tip. Maxima Chameleon is a good choice since it is a stiff, hard mono. This creates a solid butt section.
Once the nail knot is complete, cut the butt section to 24 to 30 inches and tie your leader in with a 3 turn blood knot. To a 9' leader add 24 to 36 " of tippet. We use a 5x or 6x leader and add 5, 6, or 7x as the situation requires. If a new leader is necessary, you've still got plenty of butt section. Use Knot Sense on the nail and blood knots if you like. The butt section transitions the fly line to leader much better than loop to loop...IN OUR OPINION...try it and see if it doesn't result in better turn over! A 13 to 14 foot leader system will result in better drag free drifts and in the clear and currently lower water of the Natchaug, reduce the chance of spooking that big trout! I tie and prefer the traditional knotted up leaders from Umpqua material with Varivas flouro tippet.
Try the "fixed butt section" described above...it works for us!