[Ryu James]

your setup looks great. i have converted a 1/8 on road in the past and have seen quite a few online and have never come across anyone the blew their rotor. i am thinking it is the quality of your motor. if you want to stick with 4s i would recommend a Neu 1515 or 1512 1.5D or if you are willing to add some weight and go up to 6s then Neu 1515 1.5y or similar. just look at the KV ratings and go with what suits your needs but i am confident a Neu motor will hold up much better than the one you had previously. good luck.