Is there anyway I can make it look on-center, or a good way to try to find out the amount it needs to be moved, etc, to make it look on-center? I've been able to make it look slightly on-center, but I can still tell it's off.
There's already said that the space between the U and the circle should be equal with the space between the D and the circle. Move the items until they look right is, of course, how to fix the visual imbalance. But how to measure the space and adjust it if one wants a crutch to lean on? Here's one idea. It assumes the shortest distances should be the same.
Draw 2 thin circles to the most cramped points of the text. Hold Alt+Ctrl to be able to start from the center of the original circle. Have Smart Guides and Snap to Point =ON to find the center. You must draw the circles approximately, it needs extra work to make them snap to the text,
Move the text to right with an arrow key until both cramped points are in the middle of the gap. Set small enough arrow key increment in the preferences. Count how many ticks it took.
Moving UHD and its counterpart XXXX together is a must because obviously XXXX must be aligned with UHD. But it seems to happen that XXXX looks like it is too far in the right when compared to the circle.
Moving XXXX back half of the number of used ticks seems to fix the problem as a compromise.
The reason it looks off-centre is because the left corner of the U is much closer to the edge of the circle than the top right of the letter D. This makes it feel imbalanced to the human eye/brain.
What I would do is adjust it using your eyes until it feels centred, by nudging only the UHD part to the right slightly. Obviously it will no longer be geometrically centred, but it will feel right. The human brain is easily fooled.
Something like this perhaps
The whole thing looks heavy on the left adding to that fact is the slightly angled word "bits" further emphasizing the left optically plus the negative space of the letter U compared to the H actually makes the former to wide. Editing the negative space of the letter U to resemble that of H would probably work in itself creating a more centered UHD.