Howdy intowin
If you do a lot of briskets and have your technique down,there is nothing wrong with injecting and trying to manipulate the results.
If not ,I'd recommend cooking like the Cookshack was designed.
That way you know what it ought to be and can make your minor adjustments with each cook.
Brisket ought to taste like brisket IMO and it is up to the cook to cook it correctly.
Smokin Okie would step in here and remind to take very good notes,so you can replicate your past results.
Just my $0.02