You raise a valid point.
Yes of course I would sample IEM's if I could but I can't as not available to me.
With that said, when doing research I did notice that A64 U18T has mixed reviews, some claim it's the best IEM's they ever heard while others say it's not for them, whereas the JH Layla pretty much always got very highly recommended reviews. Yes, and you are right, being able to adjust the bass on JH IEM's is a huge plus.
Surprised you didn't like Lola as much. Now you have swinged me more towards Layla haha!