I think it's not an advancemap problem but a hack design problem.
You're lucky I'm bored because the answer is long to write.
You can't do it with 10 and 14, so you have to manage to put 10 and 0C instead.
I'm guessing you mean in the part after the first bridge over the sea going from north to south. I'm making this up without AM or testing or anything, so maybe it's wrong.
I'm picking that part, the upper left corner is that tree next to the sea (so you get a reference). From there, imagine an 11x7 matrix of permissions
Try these permissions
Code:
01 04 04 04 04 04 04
01 10 10 10 10 10 01
01 01 14 01 10 10 10
01 01 00 01 00 00 01
01 01 10 01 0C 0C 01
01 0C 3C 0C 0C 0C 01
01 0C 3C 0C 0C 0C 01
01 0C 3C 0C 0C 0C 01
01 0C 3C 0C 0C 0C 01
01 0C 3C 0C 0C 0C 01
01 01 10 10 01 00 10
To sum up, the trick is to use 00 to switch between 0C and 10 even if there are no "stairs". Try to use 10 only under cliff borders to avoid walking and surfing (and possible mis-layering caused of this) and to do layering tricks (go see beds in FR).
Use 14 just when necessary (for example, see in that little mountain whose only function is to cause you problems, I used, vertically, 14, 00, 10. 14 to avoid contact with the 10 in the tile over it (which has 10 to avoid contact with the water tile), 00 to allow movement towards the 10 and 10 to be coherent with the other side of the bridge.
Now I think about it, in that little mountain you could also use 14 / 14 / 14 and then use 14's in the whole mountain that is in the other side of the bridge. In other words: use 00's in the level 1 ground to switch between 0C and 10 when necessary, and then make the bridge with 3C's touching 0C's and 10's.
Hope you understand all this because it took me almost 20 minutes to write.