Have you tried the multi delay? On my Axe-Fx I use the a parallel routing where one path goes into a multi-delay -> filter (to remove unwanted lows) -> reverb (with long tail at 100% mix). The result is really close to the Big Sky, I personally prefer what I get out of the Axe-fx.
How do you get a "cloud" or "shimmer" similar to the big sky? Is it possible? Maybe someone could upload a preset if they have been successful.
A series-parallel path even as simple as you've described isn't currently possible on the FX8. Each block can be series or parallel with the block before it, you can't run a whole series of effects that is parallel with the dry or main path. The only workarounds are if your post pre-amp setup is itself parallel to your preamp (so, a parallel FX loop or a wet/dry rig).
http://forum.fractalaudio.com/axe-fx-ii-preset-exchange/77739-strymon-bigsky-style-verb.html
check out Post 14 from Javajunkie... this should do you good.
How do you get a "cloud" or "shimmer" similar to the big sky? Is it possible? Maybe someone could upload a preset if they have been successful.
Try a MLT DLY block Plex Detune set at 1/4 first, 1/4 Dot second, 1/8 third and 1/8 Dot fourth > feed into a REV block set at "Ambience" with 8 seconds, echo density 8 and mix 30-40%. Let me know, this is how I try to dial in the "puffs" that the Strymon does.