The gyro has two modes, non heading hold and heading hold. The correct term for non heading hold is rate mode, its also called normal mode but to clearly separate normal gyro mode from normal flight mode I always say rate mode.
Initialize the gyro in heading hold mode.
Toggle to rate mode and make sure the servo arm is 90 degrees to the push rod.
Start up and hover the helicopter in rate mode, you want to adjust the length of the linkage so that the helicopter will hover w/o drift in rate mode, dont use your transmitter trim, just figure out which way you need to hold the stick to keep a hover and turn the ball link in or out till you get a nice stable hover.
Shut the helicopter down and verify that any changes you make didnt cause any binding, essentially redo the limit pot setup.
Now you're done your setup and you can toggle back and forth between modes all you want w/o doing anything special. Though most of us just leave it in HH mode.
Also 79 is alot of gain, might want to back that off to the mid 60s. As for 50 percent gain in rate mode (n50) that should be pretty close.