Also the latest version of RockSim has a "Recommended motors" options that you can use to get a general idea of motors that might work for you. My typical workflow was Thrustcurve.org to narrow down the range of possibilities then RockSim to sim several options before I buy the motor(s).
But now with RockSim 10 I can start with "recommended motors" and put in different variables (rod length, reload / single use, etc.) and start from there. Here's an example for my 3.1" LOC Sandhawk with a 38mm MMT. I never though about a J435WS but looking at the table it might be something to SIM and see what it looks like.
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