It's the return on the manifold that is 82 degrees. The return on the owb side of the hx usually doesn't go any lower than 165. When the boiler shuts back off at the 195 set point the return is around 175 to 180
Ok, glad you are not putting you boiler at risk, by having return water too low.
Now I see no real problem with the Return manifold being at 82, but what is the approximate temperature of your Supply Manifold? ALSO, as long as the wife and OWB are both happy and working, GREAT JOB
If its much above 105 or so I would either; turn up your pump and see if delta T drops, or depending on where your Mixing Valve is set turn it up and see if that also brings up the return temps.
If the Delta T across the 2 manifolds is at or around 20f that is good; you can run with larger delta t's but beware you may get following HOT/COLD spots in the slab and/or heat stripping, and is generally not recommmend.