There is certainly no issue maxing it, it can be maxed in mere hours as long as you have the supplies. If anything, the experience gained should be lowered; you can max the skill without using every recipe once.
I am glad you've been able to take pride in your accomplishments! That's what niche skills should aim to do. However, from a practical perspective, to make this skill desirable and useful it will require some changes.
I look forward to see hopefully revisiting Shamanic Infusion in the future once it has become more properly realized.