I wanted to follow up here again because I found a [probably temporary] solution in Garnier Color Shield.

I know, they'll ruin it soon enough, but it is working about as well as old GFTN. I don't like the smell as much and the color is this off-putting pink, but I am just happy to be able to have good hair again. :]
scientist, cat owner, hobby photographer
2b-c, medium porosity, medium texture, protein-indifferent
former straightening junkie; CG since August 2011
conditioners: V05 Kiwi Lime, Garnier pure clean, Renpure Keratin
products: FSG, LALSG, AIF, BRHG, Tresemme hair spray
styling tools: microfiber towel for plopping, diffuser