Adjust your expectations. You shouldn't be able to sail around the globe in one game session, anyway. If you need to get 8 grids away, then plan some stops along the route. There is always a good reason to stop - discovery points, alternate materials for high end BPs, trading with the locals, finding a level 30 tame. Sail 3 zones, and make a stop for something. Log on the next day and sail a few more zones and do something else.
Sailing needs some balance, but it's what the game's about. The trip IS the game.