Pieces should already by oriented to minimize the impact of layer thickness on external surfaces finish.
Moving to 0.08 at 50% is going to knock your overall print time to the 150 hour mark!
If you have the print reliability then go for it, but would advise picking a part, printing in 0.2 with 10% ( which is my current default profile ) and also at your proposed 0.08 at 50% and comparing, I would actually be quite interested.
The part that is most impacted by horizontal face layering is likely "chin front", it also isn't too big so you can get comparative results relatively quickly.
Having said all that, go for it!