SHOUTING SPOCK CAN DEFINITELY BE MADE TO FIT THE CANON. YOUNG SPOCK KNOWS THAT HUMANS CAN'T HEAR AS WELL AS VULCANS AND OVER-COMPENSATES WHEN HE'S SPEAKING.
WHEN MCCOY COMES ABOARD HE'S THE FIRST ONE WITH THE GUTS TO TELL SPOCK THAT EVERYONE CAN HEAR HIM JUST FINE AND IT'S OBNOXIOUS. NOTICE THAT THERE ARE NO INSTANCES OF RANDOM SHOUTING AFTER MCCOY JOINS THE SERIES.
WHEN MCCOY COMES ABOARD HE'S THE FIRST ONE WITH THE GUTS TO TELL SPOCK THAT EVERYONE CAN HEAR HIM JUST FINE AND IT'S OBNOXIOUS. NOTICE THAT THERE ARE NO INSTANCES OF RANDOM SHOUTING AFTER MCCOY JOINS THE SERIES.