Yeah, I do most of the braking before turning in. Trail-braking can be faster but to take advantage of it, you MUST brake later than if you were doing it all in a straight line. So while the guys around me are braking, I'm still sprinting into the corner and brake about 10-15 later than them. This then requires that I continue braking as I'm going into the corner. However, it's a criss-cross function as cornering forces increase, I let up on the braking (review friction-circle).

And the braking is ALWAYS 100% maximum deceleration until the turn-in and feathering off in trail-braking. If you're not decelerating at 100% for every single turn, there's no need for trail-braking as it gives you no benefit in downhill speeds or times. For example, if you're decelerating at 80% for 50ft before a turn and then 50 to 0% on the turn in, why bother? Just change that to decelerating at 100% for 40ft and you'll gain more time and speed overall.

For switchbacks (and most turns in general), it's better to do a late-apex turn. This requires you do most of your braking by the time you do the late, but very quick turn-in. This lets you start accelerating earlier in a corner and come out of it faster for faster maximum-speeds down the next straight.

However, if I'm not in the front of the group, I just do whatever the pack around me is doing.