Glad to hear everything went well for you!
As to the foot end, Bubba and MAD777 have the right of it: hang it higher, and the slipping to the bottom issues will be minimized.
As to the silicone on the back of the pad, a quick search turned this thread
up. I seem to recall seeing at least one more thread discussing this; bottom line, from what I recall, is that it does work. (Note, though that I've not
tried this myself; take it with that proviso in mind.)
Hope it helps!