Hi Steve,
Sounds like you’ve already gotten plenty of good advice concerning formation flying. It is the most fun flying I’ve ever done, but it’s also the most dangerous. Don’t fly formation with people you don’t know, don’t fly formation without a proper brief, and don’t fly formation until you’ve had instruction from a qualified instructor.
And just to let you know, my L-39 team spends a GREAT deal of time on breakups and rejoins, as well as pitch outs to landing. We’ve been doing it for years and we still are not happy with them. The perfect formation flight is a goal that is never achieved, but we try every flight.
Have fun, and fly safe!
Steve