Do you mean, you have to set a bigger space than 64ticks behind the portal, so you can put a path in there?
Well, I've got an idea: add one pathnode behind each portal (not much space required) and connect them with a forced path, maybe even a jumppad path.
EDIT:
Just tried your map. Are these jumpspots for braking the fall speed? But there are just a few with a small radius. Have you tried to set a low gravity zone info?