Okay, you want to get rid of the light armor to use TWF restriction. Are you also getting rid of the restriction that rangers cannot use double wepaons with these feats? You're also giving them Improved Two weapon fighting at 9th level and Greater Two weapon fighting at 15th level. Giving the Epic Feat for free causes problems becasue you also need a 25 Dex, and not all Rangers automatically have that. So, I suggest forgetting about giving the Epic Feat for free, but giving the other feats for free should not be that big a deal. If you are going to make the Rangers the masters of TWF, then I suggest doing this. Might as well complete the process instead of doing halfway.