Bassy or V-shaped and well-isolating IEM for up to $300

[SSSN]

I need a bassy or V-shaped IEM which isolate well. Already tried the SE215, but it's too honky in the mids for me. I really liked the Dunu DN-1000, but they were very uncomfortable.

 

[Tail]

  I need a bassy or V-shaped IEM which isolate well. Already tried the SE215, but it's too honky in the mids for me. I really liked the Dunu DN-1000, but they were very uncomfortable.

Well bassy earphones usually have dynamic driver and therefore are vented a lot more than BA ones (that can have no vents) so they isolate less in general.
You could try Sennheiser IE80, comfortable and bassy with somewhat V shaped sound but don't expect isolation like foam tip fully sealed BA earphone. Still IE80 seal well and isolation is pretty similar to most other in ear sealing earphones, just not extreme isolation like Shures with foam tips or Etymotic for example. 

 

[SSSN]

Yes, I thought so. Dynamic headphones really tend to isolate poorly. Maybe I need to get used to a BA sound signature.