Buy a piece of TE stock at the LHS. Cut 1' sections. Tack glue the piece at each wing tip to the underside of the wing, make it so it has the thick section in the front and even with the LE of the wing. Round the bottom LE part of the TR stock, not a lot, just enough to take the sharp corner off it. Now take a roll of Ultracoat trim and cover the bare wood starting 1/2" behind the wood rapping the trim up an over the top of the tip.

You have just made a high-lift device called an air-dam, not quit a LE cuff, but it works the same way. My friend had a slope ship that he just could not slow to a landing without it tip-stalling, after doing this to it it was a *****cat. The nice thing is it's easy to remove, and if you want you can take it off a little at a time.

The suggestion that you land without seeing the bottom of the wing is a good tip. Close to the ground if you can see the bottom of the wing you better be flaring, because the plane is going to be on the ground shortly.