I would concur with a lot of what has been said. Are you using a changing bag to load the reels? If so I would recommend cooling your hands under running water (but don't make them numb!) before putting them into the bag. If you can store the bag in a cool place too that may help. This might sound mad but I went through a spell a few summers ago when the weather was warm of suffering from 'sticky' reels. Having cleaned and thoroughly dried the reels with no success, I figured that the sweat vapour from my hands might be causing the stickiness so tried cooling them before starting. This seems to have solved the problem. Might not work for you but it is worth a try.