This forum is a bit quiet so I will slide it back up the page with something that might help someone.
I have been doing some experimenting with tips and would like to offer a suggestion for anyone like myself that is struggling to get a good secure fit and seal due to the relatively short nozzle on the IE600.
None of the stock tips were worth persevering with for my ear on terms of both fit and sound.
This has been mentioned a couple of times earlier but it is worth repeating. A thin ring around 2mm wide sliced off the stem of an old ear tip with a craft knife makes a very good spacer at the base of the IEM nozzle to hold the tip just a bit further out. Pick a tip with a black stem and you don’t even see the spacer, or you could get funky with different colours.
With that spacer in place the Divinus Velvet ear tips work exceptionally well. The stem has a flange at the base and with the spacer in place on the nozzle that flange tucks snugly behind the ring on the IEM nozzle so even with the reduced length of the stem on the nozzle they are really secure.
A couple of millimeters might not sound like much but it makes a really worthwhile difference to the insertion depth and the effectiveness of the seal.
Listening now with the tips set up as above from iPhone 15 - iFi Gryphon as the DAC - Astell and Kern PA10 amplifier and they sound fantastic.
https://hifigo.com/products/divinus-velvet