Beams tire model in general (In my opinion) isn’t as good as the other mainstream sims. Slip angle isn’t the same for all slicks. there are a wide range of making slicks. In general for open wheel tires you would expect a peak slip angle (the highest angle the tire can “yaw” at) in a range from 4.5 to 6.5 and even in the same tire that can change from heat and how it was loaded. These tires do feel like they have too large a slip angle which is why you can use a lot more steering lock. My guess is stiffening up the sidewall would help the slip angle and the grip under braking. I would like to stiffen the suspension a little bit but my guess is that it’s a little soft for a wide range of roads for beam. But I would also wanna change the high speed compression/rebound and preload.