A 13.5 BL motor is not particulaly hot... we run them in our touring cars as a stock class (27turn equivilent) although with the rise of timing advance timing/turbo speedos we are now somewhat faster than we achieved with the stock brushed motor, but I would have thought your Astute would be fine...
Brushless motors do generate more torque than the equivilent brushed motor, but guys used to run some hot motors in their Astute's back in the day without issue... my only concern is that you might be dissapointed with the speed from a 13.5
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