If you are trading just one pair, I would place more than one order per direction. Say 4 buy pings and 4 sell pings. Look at the market and try to guess what could be a reasonable price range (max and min) for the next hours-days (good luck with this).

As a minimum you should create a stop loss wherever you feel comfortable with, and rise Min % Garanteed Gain a bit. What is a bit? Well, it depends how wide is the range you guessed and how expensive are commissions and fees in your exchange/market. LTC is not one of the currencies with widest daily ranges. I would try with 1% and see how it goes.