Unison worked really well on my last match.
I still like feeling like the motion is still initiated by the right arm however serves were more consistent when i bent my elbows in unison to start my motion.
The other thing I had to figure out was the type of rocking pattern.
I am definately a pinpointer, I totally lose rhythm with wide platform stance.
i like having my weight on my right foot first then rock my weight to the left foot at the first part of the takeaway then when i take back i back on my right(rear) foot then do my pinpoint at the last stage of my serve i feel weight is back on the left (front foot)