Kevin,
It looks like you created these parts in another software and then imported in the sketch to Inventor. Nothing really wrong with doing that, other than you cant make precise adjustments to the parts later on. The elements in your sketchs should be fully constained... or at least grounded. That is just a good practice to learn.
On the adaptivity, you should also turn it off after you are fininshed with it. It looks like the reason that its on is because you have created workplanes and workpoints from other geometry. I dont really see the reason for all the workplanes, axis and points.
It looks like the FrondAssemblies will eventually be bolted to the SeatBackPlate, so why not put a hole in the plate. It would make it really easy to constrain the FrondAssembly to the plate then.
Something that you could do here, is make the seatbackplate, gearMatchingSidePlate, GearMatchingSidePlate_Mir, Spine and FrondAssembly a subassembly and use that on the left and right side. If you still want all the parts to show in a parts list, change the BOM structure to "Phantom". That way you only have to get the FrondAssembly's constraint to one half.
For round parts with a hole that needs to be constrained to the hole, use the insert constraint rather than two mates. The insert constraint is like a "two for one".
For the constraint on the gears, use a Motion constraint (Constraint Command, Motion tab).
Attached are the two assemblies that I created/edited. I appended KA_ to any new constraint that I created.
