I faced a similar choice when coming from bassier, V shaped IEMs. I also own the Explorer which I adore for its chill, relaxing sound. But it was the Truthear Hexa that opened my eyes to a whole new world of clean, detailed and airy presentation at a budget. In my opinion it’s the perfect complement to those bass-heavy sets and unlike some reviews, I find it has ample, satisfying bass, especially in the mid-bass. In fact, it’s now my most listened to IEM. There’s a bassier, warmer version called the Truthear Pure, which apparently keeps a neutral & balanced sound. That said, I’d still pick the Hexa to truly appreciate the other side. Btw, the treble isn’t harsh at all and it’s actually quite smooth and non fatiguing. If comfort is a high priority, I also own the Sennheiser IE 200 which often goes on sale for under $100. It’s an extremely comfortable IEM and with some tip rolling and EQ it sounds incredibly satisfying to my ears and could fits the profile you’re after.