Before Your Hand Catches Anything, It Should Shake The Umpire's
Aside from good receiving technique and using proper glove positioning, there is no better way to get those close calls from an umpire than to develop a rapport with them throughout the game.
This all starts with a respectful handshake before the first warmup pitch is ever thrown. "Hello sir/ma'am, my name is XXXXXXX, nice to meet you. I'm going to do my best to make sure that if anyone takes a beating back here today it's not you."
This is the first lesson I teach every one of my catchers at every competitive level.