I would check a couple things because it should not be that hard. i would start by making sure that you have the correct bolt ropes for the luff groove. My boat originally had a twin foil that used a different bolt rope than the Harken furler that replaced it. These bolt ropes had a lot of friction and would jamb easily. A good quality prefeeder is important. Otherwise the sail can get bunched up in the track or partialy jump the track if you don't have one and so offer a lot of friction. If you have been lubing the track, then you might need to clean the track. My last boat built up gunk in the track that really made using the foil a pain in the neck. Then there is the recommendation regarding Sailcote which only lasts so long.