I spoke with Glen Trew at TrewAudio. Many things were discussed but basically it would appear that the MKH 8040 is definitly a lot more sensitive to wind/ground vibrations then the MKH 40 is, even using Rycote suspensions + mounts there can be problems. For most people you will be able to find a Rycote system that will work for you, but for me I think I need to sacrifice the pros/sound quality of the 8040 for the stability/it's going to work of the MKH 40, because I will be in some really windy and "vibraty" enviroments.
So a pair of MKH 40s, a pair of MD 441s, some RE50s, and a few vocal mics should do me well. I just gotta find that stuff really fast before my flight leaves.
I've made a few posts about these personal-to-me topics, so please feel free to jump in there. I should probably stop hijacking this thread tho..
And if anyone reads this and wants to trade MKH40 's for MKH 8040 's leme know! FS: Almost New MKH 8040 pair - Will Trade for MKH 40
Sennheiser MKH 40 vs MKH 8040
Stereo Pair for Recording Bright (and Uncommon) Field Material