How much water do you add in the Chris Jenks method?
I just use white distlled vinegar 5% and never have to use water. Enough so I can stir it efficiently in a bucket or shake in a jar. Can use great equipment to stir rapidly every day for 1-2 weeks. Like a drill with a paint mixer attachment or a hand blender. Really helps. Honestly with all the complexities with preparations none is better for my needs than the simple vinegar extraction to Ammonia precipitate. Once I tried it I was pretty won over with the final product.
Yeah, I think you have the right idea. Best to use an excess of vinegar to ensure you neutralize all the alkaloids. When you neutralize the excess acid with ammonia, ammonium acetate will be formed but after filtering out the precipitated alkaloids, quick water wash will get rid of the NH4COO. Theres no need to use heat at all with this method. I'm guessing its better to convert your isolated alkaloids back into salts to increase their shelf life (since salts are more stable than the free base form).