Had that problem with my new ones.
Brought them to gone fishing and they changed out a part. (sprocket I think)
Worked better but I have found that you have to be careful with the rinsing off after use.
Trick is to not get water in the brake.
I tried to adjust the brake with a 9/16 but found that the adjustment was too fine.
Too much and the break would not hold or too little and it would not spool out.
That's when they were new.
Mine work great now as I think it has some wear on the pads and I keep it dry.
When I let my gear down I use the brake and keep my thumb on the spool.
It helps to control your speed going down.
Perhaps these new HP's need a brake-in period?
I had my braid get wrapped around the axle the other day from bouncing bottom and going up 10 feet.
Took it apart on the water and fixed it.
I then made the brake adjustment and the brake worked way better, like the old style.
You might want to bring a wrench and adjust with that as it is saves steps with the 2 nuts