I did both suggestions (found here) of lengthening the slit a small amount and the two nickels to squeeze the suede thinner. Now, after 8 months of use, it is getting easier to put on.
Because there is no room in the case for this strap (my accessory box is filled with extra strings, battery, capo, etc), I attach the strap to the end pin before going out, placing it over the strings, with the end folded over near the headstock. That way when I go to play, I just need to attach the strap at the neck pin, which is easy. I don't leave the strap in the case at home.