That is what I had issues with when I started my hair loss journey and it was nizoral specifically who pretty much cured it. Used it for 2 weeks, came back slightly after another week, just it for another week and it hasn't come back in 2 years without ever touching nizoral.
What regenpure shampoo do you use? Nizoral is harsh and might have the opposite if used too frequently and/or too much of. Think I mentioned it to you before but I use Regenepure DR these days and is much nicer to your hair and scalp and has keto in it, but a smaller amount. Try it if you have access to it for 2 weeks.
How long have you been having this issue. If it's over half a year it's been going on, it could be minoxidil that you are sensitive too.