After two years of "trial and failure" I've finally replaced the ear tips of my Shure : r/headphones
SHURE SE215 In-Ear Headphones | Kytary.ie
SE215 Pro - Écouteurs professionnels Sound Isolating™ SE215 - Shure France
Custom Sleeves. For Generic Fit In Ear Monitors and Earphones
Update on modified Shure se215. Working with the thermoplastic has taken some trial and error but now have a decent fit. Paired with some memory foam in the silicon tips.. the isolation