All the traces go off to infinity. The dynamic equations need something to limit the variables to a finite range. A plausible hack is to add a small negative c

All the traces go off to infinity. The dynamic equations need something to limit the variables to a finite range. A plausible hack is to add a small negative cubic factor, like Rʹ = −1.96R − 6.46J - 0.1R³ Jʹ = 1.28R + 9.48J - 0.1J³