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I've had a very simillar problem to this with a Fun600-18 when I changed from 13 nicads to 5s. The increase in battery voltage causes an increase in motor rpm so you need to change to a smaller pinion. In my case, with the 600-18, I couldn't get a small enough pinion and so I had to change to a lower revving motor.
With your 600-17 you should be able to use a 13 tooth pinion (smallest available) and get a headspeed of just over 2000. You could pull that down to 1850-1900 on the ESC without too much efficiency loss. Don't try to run it on 6s. With your current pinion it will be trying to drive the head at over 2800!
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