1. Market share does not equal load factor. What was your load factor with competition?
2. 142 passengers seems a bit high for a 733. Are you using HD seating? If so, you're going to get hosed on a route that long.
3. What is your RI on the route. Your CI appears to be 20, which doesn't help, but also doesn't warrant a 30% LF.
4. At your current CI, I've found it best to run about 10-15% below standard as this seems to improve net revenue. Once you hit a 40-50 CI, then I'd suggest using standard pricing and reseting at least 2x per game year.
My guess is #2.