If you worry about percentages and numbers like that too much while you're trying to fly an approach or at any other time, you're not doing your primary job which is to fly the plane.
Just use basic airmanship, if you're slow add power and if you're fast reduce power or configure accordingly. This applies to any plane, jet or otherwise.
People who get all wrapped up in the numbers need to remember that the ambient conditions, aircraft weight, etc., are always different and what works one day may not work the next, particularly when you figure in gusty conditions.
What are you going to do if you have a hard number such as 65% N1 and the aircraft is going below target towards ref? Are you going to leave the thrust alone? Are you going to stay on the slope if you lower the nose to increase airspeed back to target without adding power?
It's not too difficult a concept to understand.
Pitch and power, pitch and power, pitch and power!
That applies to steep turns, approach to stalls, climbs, descents, level flight, approaches and everything else in a jet as well as in a prop, piston or turboprop.
Give the plane what it needs and don't worry about a bunch of numbers and you're life will be a lot easier.