I had an Axis and a Quake. Both have the same .21 engine and both reacted the same as you describe after break-in. I found that what worked best for me was 2.5 turns out on both high and low needles would work well. What I would usually do was start with that setting and get it started. Then after it was running I would slowly increase the throttle to get it to rev at a high idle until the engine was warm then adjust the high needle clockwise about 1/4 turn to lean it out. Keeping an eye on the temperature. I had very good luck with bashing both vehicles. I broke many parts, but the engines on both are still running strong after almost 3 years. I sold them both to friends that are still enjoying them.