Yeah I usually do. Normally use Whizzer or Spinfit but I recently also bought a box with various tips (bass, vocal, balanced) from Fiio.I have not heard the Chu 2, I didn't really like the original Chu, I found it a bit boring. I don't find the Krila to be harsh in the treble and the bass is certainly prominent enough for me. I also found the Krila to be tip sensitive so it might be useful to do a bit of tip rolling. YMMV of course, as usual.
I really think it is low on bass even though I am not a basshead. I have all the switches to the on position but still find the Chu 2 more enjoyable. Also never heard the original Chu. I also think the Chu 2 sounds better than most KZ IEM’s except for the PR1, DQ6 and the ZEX Pro.