Hunters have a speed of 750 m/s \ 1000+ m/s. How your speed will help here, they will always catch up if they wish. shields + ECM + "silent running" + heat sink = will help
upd: Hunters also see perfectly well targets that are heated to less than 19%
No amount of speed will really help with a Glaive but as with all problems the best way to deal with them is to try and avoid having them in the first place. Some tips that help with this;
Bookmark the rescue ships and put them in favourites so they can be quickly selected. Bookmark the Port you are rescuing from and temporarily put it in your favourites as well, until you are done with that Port. Switch the temporary bookmark to whichever Port you are rescuing from at the time.
To avoid being hyperdicted more than necessary filter the Galaxy Map by State and tick all states then untick Thargoid Alert, Thargoid Invasion, Thargoid Controlled, Counterstrike and Thargoid Titan, then apply the filter to your route. This will mostly ensure that you only get hyperdicted at the target system, if at all, unless it has no choice but to jump you through a Controlled, Invasion or Alert system due to your particular position and range at the time.
Use the bookmarks to quickly fly between destinations without worrying about them not showing in the Galaxy map due to the state filter.