HiI have the Westone2 (117dB/1mW) and Aurisonics ASG-1.3 (120dB/1mW). Both work fine with Samsung flagship phones...then I ended up needing to charge a dumb dongle anyway (on top of a recent Android update that effed up USB audio digital output to my desktop system again), so I now have a Hidizs AP80 (using it via line out to my amp). It's already overkill for those but if you really need to go louder then instead of more power then higher sensitivity is one way to go.
Unfortunately these IEMs are also not being made anymore but my beater IEM, a Nicehck DB1, still has the Hidizs AP80 as overkill for it even at 106dB/1mW. But in your case with an AP80 Pro already making more power, depending on what you were driving before, this might be insufficient...not to mention the DB1 has a rather odd shape to the shell on the side that contacts the ear conch.
What exactly were you driving with the AP80 Pro before? At the very least look into the sensitivity of that and try to find something that has roughly the same impedance but has at least 6dB higher sensitivity.
I have been using Sound Magic E11C, their sensitiviy is 112db/1mw so the Nicehck DB1 at 106db would be an improvement.