chickenmoon
1000+ Head-Fier
I had a sneaky feeling back then that the kpe could benefit from vent blocking but be careful as I think i damaged my kc07 that way recently as the iem would lose complete sound on left ear if I pressed it in a bit too hard and it suffered from channel imbalance after I did the tape mod. I am not sure if it was the tape mod or the iem itself but that is why I returned it back and will try and get the kpe as replacement.
Blocking back vents reduces bass a bit and I've never had any issues doing that with other IEMs but thanks for the word of caution anyway. Your issue with losing sound on insertion seems more like a typical issue with lack of front vents or blocking the front vents or am I wrong?