Well this is not USGT. I hardly use drag brake in USGT and 17.5 (maybe 5-15%).
But I need it more in F1. It is due to the 1:1 ratio and combination of a really free drivetrain/lower magnetic strength of the rotor. At the moment, my Justock is able to go much higher drag brake rates. A few of the fast F1 guys at my track run really high drag brake too and some don't, so its just a preference thing. Luckily the Orca can be tuned for extremely smooth push brake.
I will check with ORCA to see if there is a reason the drag brake stops at 25% or if they can make the next software update go higher.
EA