Your request is pretty much impossible to pull off. You'll have to focus on either perm control or protecting your shields. Personally, I find perm control is much more useful and universal. Protected shields still fail against momentum, while perm control is most often useful. That said, you wouldn't need more than 4 Deflags. Add some more damage to make it faster and possibly remove a shield. The faster you are, the less are the glaring weaknesses of a one-dimensional defense exploited.