i have a leo 4082 x2 1600 in my pursuit and run a balanced and sharpened x645 from ose . that setup i got a best of 57.4 and believe i could have hit 60 that day but i backed off .so maybe try a x645 .
if your running any prop that starts with "M" its gonna cavitate off the line as these props are designed to get more top end at the sacrifice of holeshot power .
i think my setup could even run a x646 and i plan to try that .
i have a spartan as well and like you mentioned its pretty good in stock form ,all i have done to my spartan is a better cooling jacket and i run a balanced and sharpened blackjack 29 prop(same as a prather 215)and my best with that has been 56.7 mph . its has great torque ,a good holeshot and plenty enough power for me .i have not felt the need to upgrade it .
have you calibrated your throttle (tx)since the upgrade?that comes to mind too. good luck and report back
volantex vector pro ,proboat veles 29 , traxxas spartan, hobbyking/tfl pursuit ,ft009 with rescue rigging
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