I just tested. At 150%, your Purple's won't go through. All the moves that can hit us at that point are close range. You would have to approach. :D
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Everything you write, Joker, seems very... dramatic.
I have to admit, though, that the held aura sphere, or "shield" as you call it, does provide you a short respite from pikmin throw. However, charging it while facing away has it's drawbacks.
The position limits lucario to only 3 means (if I've missed any let me know) of escaping an approaching Olimar:
Spot-dodging, Rolling, and Shielding.
Because you are on the edge, rolling only works in one direction.
Because you are facing away, firing at our approach is not an option.
All of these options can be punished by Olimar with relative ease. And, since the "aura shield" is not effective until you reach 150%, the punishment would most likely be fatal, even with QCDI, if the Olimar knows what he is doing.
If I were you, I would reconsider the tactical situation you are putting yourself in when you use this aura shield, especially on smaller stages.
OH I get why it seems so dramatic! You center align all of your posts! Isn't that...
...INTERESTING!