I'm about to put a lot of you on blast right now .. I'm sorry but you need to hear it. YES TRIM THOSE CANDLES! If the candle doesn't light TRIM IT. If the candle won't stay lit TRIM IT. If you don't know why the flame is so small, you can trim it TRIM IT.
Sometimes I wish all of my life's problems can be solved by trimming a candle .. but unfortunately only candle problems can be solved by candle trimming *sigh*
moral of the story- Trim your candles please