The raw basics from my perspective.
To me, I smoke at 225 also. I smoke to 190-195 and start poking every 30 min or so for it being butter tender to slice, You will feel a little difference in different parts. I usually slice the firmer parts, and the softer more done parts basically "chop" themselves as I try to slice in that area.
For all chopped, I would keep it going usually to about 200-205 and it will soften all of it up to feel by poking it various places- Most tough briskets are caused by not smoking long enough to get it hot enough. That was vary hard for me to learn and trust, but that is the way it works.
Then pull it out and foil it in a cooler for about 2 hours and you should be good to go for some great hot chopped brisket.
You can vary the rubs and what wood you use, but to me, this is the basics that work for me every time.
Good luck to you, and let us know how it turns out.