OK Russ,
I've looked in depth into Dynamic Blocks and parameters (basically teaching myself it - as of yesterday).
Attached is a revised copy of you door style I've modified the single door (I haven't touched your double though)
Basically your problem was with the flip parameter you needed to keep it centralized between the two jambs. which if you think about it, is half the distance between your structural openings. So... if you create a stretch action, and select the structural opening parameter as the source, then select box around the flip parameter (all of the axis) and enter the distance multipler of 0.5. Then what ever structural opening or leaf size you create the flip stays in the center.
Finally, make sure that all objects are included in the flip selection.
I've also attached what I created, it may give you some ideas
hope you understand all this,
Regards
Kevin