If you are seeing immediate results (although not permanent) then you should do FTs every day for a longer period of time, say 10 days minimum. The good bacteria needs time to colonise so the longer you feed your colon the good stuff the more chance it has to stick. You should also think about elevating your bum when doing the FT to let gravity do its thing and take the enema all the way through the colon. Start on your left side, then back, then front, then right side to help the "goods" get to the whole colon.
Good luck and let us know if the FTs work for you.