1: As you know, it isn’t always possible to peak in the same way in both events, since, in the window of opportunity you can shift more to the right to improve the chances at the trials (what you need to do) or shift a bit to the left to leave the big meet in the sweetest spot.
This applies mainly to top athletes who are close to their ultimate performance, however, an improving athlete who scores PBs at the trials may well generate a bigger rebound with increased performance at the big meet with sufficient care in scheduling/competing.
2/3: That’s better for the scenario I envision in point 1 than a four round deal as in the US trials last year.
4: In a L-to-S plan, it is critical to get in the number of races ideal to a peak (more critical than in S-to-L because you have a shorter time at max velocities beforehand) so you need to fit in 5 100’s and 3 to 4 200s before the 10day taper.
Be sure to get that 10day taper video to see how that can be managed in reality- not just theory!