A little news, I picked up a pair of used mg7 Atrios and decided to get a pair of custom Softerwear silicone sleeves. I have to say, these really are a step up in terms of quality and fit from the other custom tips I had. The Softerwear sleeves are better designed and look to be much better built. They fit very nicely and are comfortable. Custom sleeves are definitely the way to go for universal iems, at least for me.
I also picked up the TTVJ Slim portable amp for my Future Sonics MG6Pro Ear Monitor. It has a warmish, very cohesive and very smooth sound. And--this is quite neat--it has an excellent synergy with the Atrio! It does a great job and eliminates much of the low treble hump that sometimes can be noticeable on certain songs. Cymbals resound nicely and the Atrio overall sound even better. It's so much better than the poor pairing I found with the ibasso t3.