I'm a big fan of the JH products partially because they have been in the business for a long time, respond well to questions, and have a variety of driver options. I auditioned most of their lineup and settled on the JH Audio 10x3 Pro. See link below.
It's a great CIEM because it doesn't have a ton of drivers. It's easy to drive with a portable, but also sounds good out of a good amp like the THX AAA 789. The bass is just emphasized enough to sound pleasant and never boomy or overpowering. You can extract those treble details in chimes, cymbals, and brush strokes easily with this CIEM. If you're still in the market I suggest looking at this options. I've had mine for over 5 years with no issues!
https://jhaudio.com/all-item-groups/products/custom-fit-products/jh10x3-pro-custom-in-ear-monitor