Help with WITP Rules

[Currahee]

I'm having problems in WITP in two areas:

1. In a scenario with production turned off, small map, I can't get my damaged ships to leave the map, and head home for repairs. When they're in port, "return to Osaka/Kobe" is an option, but when I select it, the travel distance is shown in red, and the TF won't go anywhere...

2. What is the significance (if any) of assignment of land units to a particular HQ? I can't find it dealt with in the rules; it takes political points to reassign, so you'd think it would have some impact...

Thanks!