OK, this gives me some confidence. I was perfectly fine with my body positioning, and I know how to counter steer, but I wasn't confident in it being safe/permissible to even feather my brakes ('modulate' as you say). It helps that I have carbon rims that the brakes are a little forgiving in not grabbing quickly for sharp braking, which makes modulating easier I think. Thanks. This is helpful. My next race is Sunday.