OK here are the facts
The EPL will give you slightly more power and each engine is different it must via certification give at least 100% power
Its designed in the event of an FCU failure and its the pilot that controls the power now and not the FCU via fuel in
Next over temp the blades and you will have an expensive fireworks display out side with along a loss of power.
Next there is no un metered fuel sent to the nozzles in normal operations only metered fuel even with the use of the EPL
There are on ALL PT6s two different nozzles a primary usually around 4 and 10 secondary each engine has different specs.
The primary start the engine and at around the 22% mark after light off the second set is opened by the flow divider by increased fuel px and acceleration up to idle occurs.
Tq limiters are not on ALL engines.
Next the more fuel in the more heat is produced. Less fuel less heat. Less heat less power and so on.
Generally around 54 turbine blades in the ct wheel. these take the most heat and as such are the easiest to damage. damage these blades and it don't matter how much fuel you put in power will be lost.
in the 114A each blade produces around the 25 hp mark. That include HP to drive the compressor which a rule of thumb is around SHP plus SHP Ie 675 plus 675 to run the compressor ,
So in the event of you having to use the EPL be very careful you may do more damage to your self but watch your ITT temps when using it.
Cheers