As with many trad archery posts like this, you’re going to get a lot of variation in answers. You are also going to be told many times over, your question doesn’t provide enough information to allow for an answer with any degree of accuracy, if accuracy is even possible when answering this question.
I believe your answer is in your question. It will be very individual for both you and the bow. Each bow is made ever so slightly different, as is the shooter. It’s a unique relationship. With that said, I will lend some advice on things to consider when looking at arrows.
In my opinion, maybe the biggest factor that will determine your arrow spine requirements, outside of actual draw length and poundage at that draw length, is the center cut of the bow. I can shoot 29” GT trad 500’s with 100 grain insert and 200 grain point out of my bow that is cut before center. Take that same arrow and shoot it out of an identical bow cut past center and it will be weak. Know where your bow is cut before considering arrows.
Make sure your draw length is accurate. It doesn’t matter what your compound draw length is. You need to know if you’re short drawing, collapsing, etc. so that you can have an accurate measurement. Then scale the bow at that draw length. Determine your desired tip weight now as well.
Now armed with that info, buy a test kit of several full length shafts and shoot them.