I always ran my reedy motors in the 40° timing range but after talking to Sean at Reedy and going with his suggestion of changing the ratio a bit and lowering the timing I am alot happier.

Charging at a higher amp rate doesnt overcharge the pack, just gets you there faster. You are not setting yourself up for something bad if done properly. Some batteries are rated at upwards of 5c rate, that means if its a 5000mah lipo you could charge at 25amps. But, if you run by roar rules they state max charge rate is 1c.