Perhaps you and Lifespeed don't understand that whatever the high efficiency salt dose is it will be sufficient to regenerate the capacity of the used resin. We started out with fully regenerated resin, used say 20k and regenerate the 20 K, where do you see resin with hardness on it?
I think you've taken to heart some of the twin tank softener selling guys marketing hype about upflow/counter current regeneration. That should only be applied to boiler and other waters that require a max of X number of ppm and no more. They don't deal with gpg as residential softening does.
That 0-3 gpg, that is of the raw water and is used to determine IF 'you' would benefit from buying a softener.
When you have a softener, it should always produce water with no more than 1 gpg of hardness break through, so says the Water Quality Association.
I say, if we can get it down to no more than 1 gpg, we can get it down to 0 gpg. And for many years I've done that for all sizes of houses, families and businesses regardless of their peak demand flow rates. But you don't have to believe me if you don't want to. Or you might want to try my way for a month or two and see for yourself. Does your 7000 record the highest gpm for you? If not and you over run the SFR of the resin, you might mistakenly think you're not regenerating with enough salt.