Hi Ananda,
I am not sure if you are familiar with Byron Katie's method of self-inquiry but I have used it on crown issues quite a few times with success. A couple months back I was experiencing a lot of activity at the crown at a time that I had a lot going on and was worried about that it was creating or contributing to overload. The more I worried, the more I inadvertently thought about it, worsening the cycle.
I eventually sat down and wrote down every belief or worry I had about the crown. Examples like "Too much crown activity will make me unstable", "I am going to have emotional issues due to this over-activity in the crown." "I won't be able to meditate, this will ruin my day, it will hamper my ability to find balance" etc. etc.
I went through "the work" on each and haven't had an issue since. My fear was clearly contributing to the situation. Maybe this will be helpful for you? Or you may just need to scale back, one thing is for sure, only you can know.
I have been meaning to write Yogani recently and ask if he will do a lesson on all the simple ways we can "screw up" the simple instructions of AYP.
I noticed that I was experiencing overload but had tinkered with the base-line system in ways that I wasn't fully cognisant might be an issue. For example, I was doing deep meditation and one cycle of pranayama but had never let go of doing samyama. I was reluctant to give up the practice and didn't clue in that it could be contributing to overloads. In addition, I had added in a few of my own sutras which as Yogani points out has unknown results and should be considered research in itself. Of course there is the possibility that this was contributing to overloads as well so I finally let much of that go as well.
Every time I sat I also used kechari 1 which had become so subconscious. I sit in siddhasana too, another amplifier, I do, samhavi, moolabhanda etc. These have been so automatic by using them over the years that I forgot about them and didn't calculate their contributing impact.
Worth looking at!
Good luck to you my friend![
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