You can add a very tightly wound spiral flu flu behind normal fletch. I take a 4" long, 1/2" high banana cut spiral wrap feather (thin quill) and wrap it tight (quill to quill) right behind my normal fletch to make an intermediate flu flu that has a max range of around 100 yards.
At 20 yards, drop is negligible compared to my regular fletch whereas standard full length/height spiral flu flus hit 2-3 inches low at 20 and have a max range of around 70 yards with my equipment.
Fletch tape and tying in the ends with floss or thread make applying the spiral a snap if you have the clearance between nock and back of fletch.
If I can figure out how, will upload a pic.