Hi Simon
I've adjusted the surveys of 0106 Torcón so it makes more sense (I think). (3d file attached) The outcome is that it may have revealed a major mistake in the old survey.
The old entrance passage, shown as a red dashed line from "entr" has the same general bearing as the survey of the blue stream below.
Your new survey (surface survey noted and entrance coordinates adjusted) lines up nicely above the passage off the King Horn traverse.

Your angle down the entrance slope seems to be about 25 degrees different from the old one. It may have been a duff compass that was used in the lower passage? I've always thought that the lower passage didn't line up with the joints in Third River Inlet. Your new survey lines up much better.

So, I'm thinking that you need to put half a dozen legs into the streamway below to check old bearings, or resurvey it!