Well... I`m more a laid-back guy but maybe in future, who knows.
Because it is hard to know what driver it uses and with finished enclosure I can see their modding potential better
I think this first pair I will leave with original cables (though I kind of "hate" straight 3.5mm jacks). Will probably order second unit anyway for modding for girlfriend.
There are tuning ports on Your wooden Yinjw? Mine has only open back grills on them. We have different version?
This is my version (black without mic):
http://www.aliexpress.com/item/Hot-HIFI-Monitor-The-Movement-Of-Wooden-Bass-In-Ear-Headphones-Earphone-Bass-DIY-Magic-Sound/32378933536.html
This is Your version? :
http://www.aliexpress.com/store/product/2015-Newest-Original-YINJW-Wooden-Bass-HIFI-Monitor-Movement-In-Ear-Earphones-Wood-Headphones-DIY-Headset/1825606_32487808552.html
With cut-off/shorter body and closed backs I find no noticeable reduction in soundstage and they actually become more airy in some way, probably because of gained clarity and bass "balancing". But I will test with small port hole also and report back
Btw, I use my portable rig & desk rig for testing and evaluating without any EQ or bass boost, I never use them, always flat settings.