dt ints will not enable intcon PEIE you need to
yes with the newer chips some interrupt enable bits and flags have been relocated from INTCON reg into PIEx/PIRx regs
I'm not convinced dt-ints14 will always set the PEIE bit in INTCON when needed in all cases so i do it manually.
to set PEIE WITH GIE use
INTCON=$C0



for this chip and timer1 interrupts its not necessary dt-ints will set PEIE for you but this has no relationship with PIE4.0, i have no idea how you made that inference



just how does PIE4.0 = 0 stop the timer ?

writing to the timer like this when its still running is a very bad idea
TMR1H = 60 : TMR1L = 176 ' 50msec interval (32MHz, 16bit, 1:8)