No idea about that shoulder up there - seems like it would need a longer screw but how do you get that one out and a new one in?
Yeah the belts are a ****ing nuisance. Time is not kind to them. We could do with some custom alternatives because we can't be having our Uncle Bob's without belts, it doesn't look right.
As for sculpt preferences - well, when DX10 came out I preferred it because it made the face longer and distributed the facial features more accurately. Ultimately I replaced all my MMS117s with DX10 heads and bodies.
However I'm using my last remaining MMS117 head on the Phicen body for the T2 arrival and the hair looks so vastly better and the head works so well with the Phicen neck which can be moved into a very natural position unlike the Hot Toys necks which are totally stiff. If they've sculpted the neck unnaturally upright like DX10 you're stuck with that, you can't make it look better. Of course, with the arrival scene the face is largely hidden...and the face is MMS117's problem - the toadface thing - vertically squashed facial features making his eyes look far apart like a Toad.
So it's always been a case of picking the head that has the least annoying problems. These days I'm not sure which problems annoy me more.
If you could make a hybrid I'd take MMS117's hair and paintjob with DX10's frontal face shape, MMS117's eyes, MMS117's jaw cut, Phicen's movable neck, DX10's flatter chest. Unfortunately that isn't something that can be kitbashed.