With your helmet I was referring the visor portion....catching the wind. For slower speeds & exploring a visor is fine, but for trip you did...isn't the best choice. That's a reason, along with @littletommy's comment, for the aches & pains in those areas. As for comfort....perhaps you'd get used to it? I don't know. Different brands fit differently, just have to try some on, and go with your gut. You truly never know how comfortable one will be until you've worn it multiple times, and on some lengthy rides. Get it broken into around your noggin'.This is my first motorcycle and I got it a few months ago. I've done a 100 mile bicycle ride this past summer and that was a bit different but has similarities. As far as the helmet: yeah I'm considering what to do about that. The helmet fits snugs and hasn't given me any issues with regular usage. It started to become an issue at maybe hour 4 of riding. Considering modifying inside pad or should I look into a different helmet? Earplugs, check.
After your long ride, did you have any aches behind your neck/upper shoulders? And no helmet issues for you?
I wear a full face Scorpion, and have no issues after riding that long, but I've been riding/some racing (on another bike) since '06, and do many long rides when I do ride, so I've just gotten used to it.
With your lack of riding time....on a trip that long....aches & pains are expected. You did good I'd say!!