I have about 200 hours burn-in and still have trouble with treble/upper mids as well. This is on stock cable and unamped.
"Bass light" is relative. Mikros have less bass than Takstar Pro 80, JVC HA-S500, Yamaha HPH-200, Zero Audio Tenore, Zero Audio Basso, Xiaomi Piston, Fidelio S2, Monster Gratitude, NuForce NE-700X. If comparing to these, you'd say Mikros is bass light.
From memory, I think they have slightly less bass than ATH-CKN70 and TDK BA200. Probably equal bass to GR07 MK2, RE-400, A161P.
I'm a basshead, so I have to EQ these to get bass to the level that I enjoy for most pop songs. However, these are my favorite on-ear/over-ear for songs that don't require deep bass.
I've discovered that IEMs sound much better to me than on-ear/over-ear headphones. Perhaps it's because they're closer to ear-drum and seal better.