So to help you out with a few thngs...
I'm guessing your using the standard radio it will be the older type that is easily interfered with. The stutter your getting at the end of your run, is being caused by your battery running low, and not giving enough power to the receiver, this means it picks up all kinds of interference and goes a bit nuts. I used to get it happen with my TF-5 with the stock radio and nimh batteries.
For the battery size, depending on the motor, a 3300mah battery with something like a 20 turn(less turns the more powerful in simple terms), will get about 5mins of good speed, then will be noticeably slower.
Charge time will be reallllllly long on a 240v charger. Pick up one that charges off 12v, will do a 3300mah in about 50mins. The reason is as you've said, your charger is only providing 200ma, thats not much, to charge a battery normally, you'd do it at 1c. So for a 3300, that's 3.3a not the 0.2a of yours.
It's sorta been answered, but a little more info for the whining noise your motor makes and the moving forward, it's just throttle trim. You just turn the th trim dial on the radio till you get no noise. If you turn it one way, it'll move forward, turn it the other it will move backward. Set it about in the middle of that so it's not making the sound and your sweet. You'll most likely need to adjust the steering trim every time you change wheels, and mostly every time you get it out unless you upgrade your radio to one that does it digitally.
Should be plenty of places to race in syd, check out the australian racing section of this forum for more info, I know there's an indoor track at castle hill.
Supporting Aussie hobby shops:
- www.MRJRacing.com.au - - www.feralbatteries.com.au - - www.actionrc.com.au -