So, from what I'm reading, you want armor that deflects projectiles based on angled or sloped armor? While such armor has been in use in tanks and other armored vehicles since their first appearance on the battlefield, I don't feel as though you can quite as easily apply this principle to personal armor. Tanks fight in a predefined orientation to their opponents. They are never upside down, laying down, rolling about, etc. (At least hopefully not.) Thus, one of the big benefits of sloped armor is lost. Sloped armor increases thickness without increasing the thickness of the armor itself.
Additionally, if I do deflect your projectile, where does it get deflected to? A metal plate on my chest deflecting bullets upwards directly into my head and neck is not exactly ideal. Though, I've seen this issue addressed by adding shielding in these areas.
Because I have no guarantee of what angle your projectiles are going to hit me from, I will need to make my armor thick everywhere or curved rather than sloped. Thus, I think we need to start thinking archaic and take a look at traditional plate armor designs.
Plate armor was designed not only to stop incoming blows but to deflect them as well. You'll notice a general trend in this armor towards rounded and conical shapes designed to deflect swings rather than take them head-on. Traditional plate armor, however, died due to the firearm. This was not because the design was faulty, but rather that available materials simply could not withstand the force of a bullet.
Now, in your question you mentioned this being 100 years into the future. It is not that we do not already have the materials to make this armor, AR500 for instance, it is a weight problem. However, your time frame fixes this for us. If you aren't opposed to the idea, robotic exoskeletons solve almost every problem there is when it comes to armor. They increase wearer mobility in the armor and essentially negate weight limitations.
While fictitious, I think this armor's design checks a lot of the boxes. It has generally rounded armor shapes, a shield around the neck to protect from bullets deflected off the chest plate, and appears to be assisted by an exoskeleton beneath the armor plating.
I would have placed this into the answer directly, but it isn't an https link, so I cannot.
Now, with helmets, you can take more advantage of traditional sloped armor designs, as the orientation of the head relative to incoming fire is relatively predictable. Thus, placing a sloped plate of armor over the wearer's face is viable. Additionally, you may want to look into designs that incorporate a feature akin to a hinterschild to protect against deflected projectiles traveling into the wearer's neck.
An example of a helmet with a hinterschild.
Interesting note, this design carried over into more modern designs like the WW2 German stahlhelm.
Hope at least some of this was useful. Have a good one.