Sold 50 shares of LFT @ 29.90

Well, when I look this morning, the stock price was going down and I'm afraid I will be in the same situation as my VM holding. So before I go out, I set a sell stop limit at $29.90. Unfortunately, the stock price went below that and then bounce back up. I have to eat loss of 3.81%. Greed is evil, I should have the limit sell at $33 before.