EC is not going to fix your consumption issue. You seriously need to try the piston soak and then see if it makes any difference. Otherwise, you are just throwing good money after bad. If the soak makes zero difference you have a mechanical issue then. If it cuts the consumption then go with EPR at the end of your next run/s. I would also try Rislone, Gumout Multi-System Tune-Up, Liquid Moly Motor Oil Saver, or even Lubegard biotech for the full runs or Kreen at the last 1k of your OC. Run oils with ester and AN oils like HPL, Amsoil SS, the new Valvoline Restore and Protect, or the bio-based Havoline Pro RS. Something that will clean but even these are not a quick fix several runs will be required.