I definitely believe you and there are many ways to skin a cat but my approach is slightly different than yours due to the type of shooting that we do....I think? I have no experience with ILF, as I'm a hunter that shoots some 3D and that's it. I have learned a few things along that way that you allude to in your post and that come into play here. 1. Carbon arrows recover quickly from paradox and 2. shortening them stiffens the crap out of them....quickly! 3. Center cut of the bow has a major impact on what arrow can be shot successfully and 4. Feathers hide a lot of arrow problems
Honestly, I've never bought into the EFOC hype bc it addresses a non existent problem, at least in my setup on whitetail deer. What it does do is mess with my head bc it changes the trajectory of the arrow drastically when you load the front. You mention the advantages of a light arrow setup from a speed/gap perspective but 550 grains is not a light arrow. I shoot 9-10 grains per pound of bow weight and bury my arrows to the feathers on deer so I see no need go heavier. I don't need the arrow to stick in the ground, just make an exit hole. I can tell that you like messing with your trad setups as much as I do so I'm just sharing my experiences in an effort to possibly help someone else along the way.