My affinity for AFS heads largely comes from the ability to change the sink rate of the entire shooting head, giving me a much tunable sink rate to match differing depth presentation for various combination of fly and on-stream factors. So, my first step in properly loading the rod of choice, a Zpey 12'3" #8 EU class rod, was to find a proper loading AFS floating head. Although the rod lists a grain window of 338 to 416 grains, just like the process of finding the light colored shoe, I had to experiment with several heads; sometimes using heavier heads that came with truncated tips (perhaps in attempts to keep the weight within the rod's grain window) [footnote 1]. I eventually settled for a 400 grain AFS #7 floating head. This floating head discovery is akin to the light colored shoe process.