David, I still have concerns about your setup. 5.7 second laps?... Here are a few thoughts and suggestions, if I may:
1. If at all possible, consider switching to a 6S 2800 mAh setup (yes, that would require different batteries and motor. If need be, I can loan you the entire power package for the Golden State, along with a MA 12-6x3 prop; we just finished our last contest for the season). Notice that a 6S system is drawing on average 20A in flight, while your 4S system will be drawing 27A - a huge increase in current, which means it will run very, very hot. Even if the motor and ESC survive, the batteries may puff up in a few flights. If this happens, send the bill to Howard, as he said not to worry about the current-induced heat.
2. After your 2-minute test flights, check how much % of the battery you are using per minute using a battery checker, and multiply that by 5.5 (typical pattern takes about 5 min 30 sec). If you get anything more than 80%, you may not have enough battery capacity for a full pattern. Solution: see #1 above.
3. If you must stay with the 4S setup, then at least switch to 60' (eye-eye) lines. I'm serious. Same linear speed but smaller flight radius will give faster lap time and better line tension (remember centrifugal force: mV^2/r, where r is flight radius: the smaller the radius, the greater the force). Bonus: you will get through the pattern faster, and may have enough battery capacity.
4. Is it possible to convert it to a 2-wheel / taildragger? Less air drag = less energy required to fly. Just a thought.