that's is unfortunate, well the VSD1 is pretty big (compared to the RE262), but I know alot of people in my life who dislike IEMs due to fit issues.
maybe you can try Final Audio Design IEMs that BenF mentioned? They have many models that are small, light-weight, and bullet shaped.
If you are used to the RE262, maybe just get another pair of it? Or one similar, with angled nozzles and a support to rest in your concha comfortably, I recommend the Phonak Audeo PFE 122, and they come with foam tips, 100% certain.
or you can try hybrid type IEMs that have a nozzle but are worn like an earbud, for example the CKM500.
by the way, is it that the tips don't fit, or the IEMs themselves are bothering your ear? I've had that issue with the Monster Turbines, since they were heavy and big, and were extremely picky with tips - too deep an insertion and it'll bend and hurt my ear's tragus and antihelix, too shallow and the sound will suffer.
memory-foam tips do not solve every fit issue. They do help for some IEMs and users, but the majority are determined not only by the tips, but the overall presentation and physical features of the housings of an IEM. I had a friend who believed that getting foam tips would help him wear the small Klipsch Image X7i's, but it just wouldn't stay in his big ears no matter what tips were used, it always "slides out," so he resorted to a CKN70, the one with the special ring on the housing to achieve a secure fit.
Edited by stuartfang - 12/25/13 at 12:28pm