weedophile
500+ Head-Fier
To get over that u can probably try using the self adhesive tape method or use 2 layers of thick foam and then a layer of Monks porous foam if u bought the ex pack. U can also use the rubber ring as a substitute for the self adhesive tape but so far the comfort of the tape just make it better than the rubber ring.Well sadly, my ear canals is a little bigger than average size......so yeah when I mount my Monk+ it will normally fall off my ears but the is not the case for TY HI-Z......no worries I guess genera consumer will not have this kind of problem.
Anw if i am not mistaken, like @tinkertailor said, both are using the MX500 shells and sports a 15mm driver. So i think they should be the same.