Try not to use feeding tongs for anything but feeding time.
A small snake hook works as does just opening and waiting a second to let them realise there is no prey present.
To the OP, I know some people with a number of snakes that do feeding tub routines. While I have picked up a lot of useful info from these people this is one item that in practice I stopped entirely. It was just too much of a pain for me and the snakes.