Update osPID_Engine.cpp

There is redefinition of PID::setOutputLimits to 0>255 
it is redefined in void.setup as 0>100

this doesn't give a PWM limit for the pin output but gives the PID a "out" scaler
so you changed the scaling from 0>100 to 0>255 
wich makes the PID correction too drastic with high temp applications (using hot runner coils etc) 
upon deleting the redefinition of PID::setOutputLimits and compiling the PID held my set temp within 1 degree accuracy instead of the 20-40 degree wild range it had before