I agree. I started my journey with 24mg but once I went from my original cig-a-like to an ego type device I lowered it to 18. I stayed there, I am thinking, a couple a years. I listened when my body told me it was time to go to a lower strength. You are still just starting out on this journey. I think your body is telling you that you aren't ready to be lowering the strength of your nic.
Thank you, I agree!