I think those ratios are about right, a Lime to bean ratio of 1:7.
I thik the water is added to help freebase; ensuring strong contact and a complete reaction when mixing.
People can get stronger beans than others; and even when freebasing with baking soda and no water and still get good experiences. This is very rare however. Better to not waste beans and pain for naught; and follow the most successful and widely used teks, resembling those of the natives.
Blessings.
All readable matter in the above post is ficticious.
Any similarities to real life are purely coincidental.
Without prejudice.