What size fuses are you blowing? The specs on that pack say max current is 15 amps (1.5C) -- and 10 Ah rating is at 12 amps. A 1000 watt motor can draw more than that (flat out maybe 25 amps?, maybe more at times?).

So..you can try a larger fuse, but risk possible BMS damage and/or shortened battery life. What's really needed is a pack that can deliver more current...or a second pack in parallel to share providing the necessary amps.