According to datasheet table 18-1 Baud rate formulas

BRGH = 0 baud rate formula Fosc/[64(n+1)]

BRGH = 1 baud rate formula Fosc/[16(n+1)]

You appear to be using the formula for BRGH = 1 while setting BRGH = 0
I think you should try setting BRGH to 1

Phil