OK, so first off, we need more info to guide you better.
What exactly is the issue with your OHBH? If I had to guess, would it be trouble twisting the racquet about the length-wise axis when wanting to come "over the top" on a topspin one-hander? If so, then you're not alone -- I noticed this on the regular PA23, for which I was TW playtester. The issue there is mainly the high twist weight, and there's not a whole lot you can do about that, other than look for a lower twist weight frame. Beyond that, the PA98 also has a fairly polarized mass distribution, which may also make it harder to "flick" the racquet with just the single hand in certain moments, especially in pressure situations. Overall, the Aeros are just designed and optimized as a two-hander's racquet first and foremost, as having two arms on that wing is just simply a better match for the high twist weight and high amount of consistent swipe that it really wants in order to be operated at its best (think of Rafa's, or Alacaraz's or Rune's backhands... and you get the gist).
That said, presuming you still want something with similar levels of stability, power and spin, but a more easily manipulated one-hander, I would look for a 98-100 with a bit lower stock twist weight, also possibly lower polarity and perhaps a slightly lower stock swing weight, all of which will make handling the OHBH an easier experience with less strain. Here's what I would look at (alphabetical by brand/model):
- Head Extreme Tour - fully customized (will take some patience)
- Prince Textreme Warrior 100 - w/ bit heavier base grip + 2-3g lead @ 12
- Tecnifibre TFight ISO 300 - w/ handle weight and lead at 9 & 3 or 10 & 2
- Wilson Shift 99 - w/ similar customization as TTW100, only a great fit if you really hit with a lot of swipe, but if you're coming from a PA98, that may be the case
- Yonex VCore 98 - w/ 1-3g lead at 12 or 10 & 2, maybe some handle weight
Hope that helps. Any questions, feel free.