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		| Arkcon said: SJ's Pirates and Nomads mod has a good method.  It alternates noraml and phased shields in the tech tree, and each level of phased shield is weaker than the corresponding level of normal shields.  So you pay a penalty for phased shields, but you don't have to research so far before they're good.
 
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 Another method is to have 10 levels of shield generators and 10 levels of phased generators, where the phased ones require an extra tech area and have, say, 75% of the shield points of the normal generator.