Derivatives in time and phasor domains do not match
It did not occur to me that taking the imaginary part would introduce a factor of j in the second to last step.  Problem solved.  Thanks.

Clarification edit:  The difference of complex conjugates is 2j times the imaginary part, not just 2 times.  This is because Re{a+bj} = a and Im{a+bj} = b.  Then (a+bj)-(a-bj) = 2bj.