Start to E node:
Carrier Task Fleet has 75% chance to go to E
Surface Task Fleet has 25% chance to go to E
Start to B node:
Carrier Task Fleet has 25% chance to go to B
Surface Task Force has 75% chance to go to B
Either style of fleet with Akitsumaru will always go to B
Having a FBB in your 2nd fleet has a small chance to dead end route to A from B.
Having 1 or more CLT or SS will always go Start->B->A
D node: With Akitsumaru D->H. Otherwise random.
Akitsushima is reported to give D->H as well.
At J:
Carrier Task Fleet with:
3CV has good chance to go either Y or M
2CV 1CVL will generally go M but still has small chance to go Y.
1CV 2CVL will generally go to M with a small chance to go to L. (May branch to Y with 2FBB in second fleet)
4 or fewer (F)BB(V)+CV across the 1st and 2nd fleet will generally go to M with a small chance to go to L. Will never go to Y.
Surface Task Fleet generally goes L but has chance to go Y.