My daughter isn't PDA but she is autistic so I hope this is ok to post. I work in PDA provision though, so please know I get it!
I just thought it might be helpful to hear that I grew up watching Supernanny with my mum. When I was pregnant, I thought I knew exactly how to parent, I knew how to use the naughty step, how to get them to sleep through the night well etc. etc. Then my amazing daughter came along and thoroughly taught me that those neurotypical strategies don't work. I kept trying to implement them thinking I just need to persist longer etc. Nope! We then looked into ND friendly strategies and we now have the best behaved daughter ever.
My point is, it is absolutely fine to hand more control to your child if that is what works for her. There is no need to hold all control because that's what you've seen elsewhere as the norm.
With regards to when you say you get drawn I to arguments. In my professional experience I've usually found the old agree and divert to be the best de-escalation strategy. Obviously not in some cases, but like the example below:
Child: I hate you
Me: I get that. Sometimes I hate me too. Most people feel like they hate themselves or someone around them at some point. Anyway, would you prefer pasta or pizza for dinner?
Just completely removes the conflict by you not arguing back and just moving on.
Hope that reassures a little, I k ow it's tough but hang in there!!