Couldn't prove the trivia if I had too, but I read some baseball story (may have been Kn Prob. of Baseball?) but it was a long time ago. Said, umpire signals were devised for the hearing impaired, wanna say, some famous deaf player.
The crowd/teams, you had seems to have met that category.
You'd a had to pull out your bull horn to get em to stop.
Signalaling the strike and an emphatic out signal on the catch or occupied base, should be perfectly sufficient.
Don't worry, it does get better, it might just be playing into a good defenses hands, the ones that get you outs. The good catchers know the count and situation, know they caught it, flash you the glove, pump fake to 1st, then, nail one a the bone head BR's.