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After emptying the whole chalice filled with Soul Purifying Water, Raven's soul absorbed all that he drank.
He then gauged the overall strength of his own soul and guessed how much he recovered. Raven figured that his soul made another 5% recovery, pushing his total recovery to 20%.
The Soul Purifying Water didn't completely cure his soul to a full recovery but Raven wasn't expecting for it to do so anyway. He knew that even if he had more Soul Purifying Water, it was still impossible to cure his soul completely with just this. The effects of the waters will diminish the greater the amount he consumes, there will come a time when it will eventually no longer have any effects on him. Even if he consumed the amount that Venus had, it still wouldn't make any difference at all.
This is why even if he only managed to have 20% of recovery, he's very satisfied.