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As others have said as well, you won't feel overwhelmed with the GR4. If your Finale experience was such that you really want the most power you can get just "to be sure" (it may not solve your arm pump issues, BTW...that could be many other things, like grips, suspension set-up, riding technique, fitness in demanding terrain...), then by all means go for the GR4. So much modulation on tap, they have never surprised me in any riding situation.

No experience with Dominions But with plenty of other brakes GR4 have massive control other than power, tr4 feel pretty good but lack power when needed for me 81kg riding weight 203 rotors Unlike mavens with metal pads where it’s all power and no control hopes are still very strong but have lots of control so they won’t feel “too powerful”

I have A4’s and T4V4’s on my trail and enduro/dh race bike respectively, along with a set of Kahas in my parts bin. With the same pads (same compound different shape) and rotors the T4V4’s make more power with less lever force, it’s a pretty noticeable difference over long sustained and steep descents. Nod to the T4V4 for the short lever pull compared to the dominions as well. FWIW I’m 210 ready to ride and have found that TRP SE05 rotors paired with either Sinter Greens, or Hope Greens/Tricksuff Power+ pads are my favorite for bite and overall power. TBH...

I have GR4's and run dominions along side them for ages. Get the GR4's dude, they're amazing brakes. It's easy to tune power out of them if you're worried. Running the ebike pads is the go, they don't have the savage bite of the race pad, but come on strong and last ages.