how come when I push it forward more it stays and never goes above 96% on a certain PT6 I've flown?
Torque limiter in action. It acts by limiting the fuel flow.
As the power lever is increased this moves the metering computing section in the FCU
Not in the PT6 - unless your definition of "metering computing section" is very broad. The cable from the power lever goes to the speeder spring tension. Nowhere else.
Remember the power lever just controls the amount of fuel going into the engine nothing more....
I believe this is true for the Garrett/Honeywell TPE engines (in the flight range). Have never flown one but spent a few hours searching online for this information today. Perhaps a Conquest or Metro pilot could enlighten us.
If true, it would give rise to the need for these pilots to be especially watchful of the ITT during the climb.