So your N1 and TOT limits are there to protect the engine and the Tq limit is there to protect the transmission.
If you are within your N1 and TOT limits in the hover and you are below your AUM for OGE hover at those MCP limits you should have enough Tq headroom - however, mountain flying is massively dependent on wind conditions and you could have 100% Tq or 20% Tq on two sides of the same feature.
Predicting hover Tq in the mountains is unreliable so always fly through the area you want to hover first at 40 - 80 kts so you have enough spare performance to cope with turbulence.
When you have proved that the conditions are safe, do a power check to see what you actually have available before committing yourself to the hover.
Have an escape route for as long as possible on your approach and try to make a level speed reduction to the hover if you are close to your power limits (it uses less power and it is easier to notice up and downdraughts)