Arelith is not as small like to allow instant teleport by taking a Ship in Cordor and appear in a blink in the Crow's Nest, and then, in Wharftown... and then, in Brogendenstein.

While the other isles require longest sails, the sail to each Arelilth port could be like half that... 3 to 5 minutes, perhaps.
That will enhance the immersion.
[In a secondary request] I also ask for an increasing of the sailing cost for those more dangerous trips, scalating the price like this (increments that won't hurt the high level characters, but make a little more hard to those in lower levels to go to high levels towns:
Cordor - Crow's Nest: 50 gp
Crow's nest - Wharftown: 100 gp
Wharftown - Brogendenstein: 250 gp. (If there are dragons in the Dark Spires side mountains, there is a risk that dragons flight to the coast and then, that could try to sink the ship! So the trip should be more expensive.
Only the Magical gates should allow teleportation, and currently now the sail is pretty much like teleportation by some coins.
RP justification? Sure, an increase on the pirate activity that makes the laurick's service delay? more Sea monesters activity? More storms? Umberlee anger? Or just... "hey man, always was this way"

I saw once in a server a bucle of not damaging ice cone, used to simulate waves, and really increased the feeling of be sailing a lot!