Any specific reduction in mass / resources that you have in mind?
5%? 10%? 15%?
I like your idea of making the ED5 the standard blueprint, however...
I'm not too sure you want to increase the Cybran's Mass to SHP efficiency, dramatically.
Cybrans, even with their higher mass cost at a glance; they still have quite efficient shields for what they're worth.
For example, the UEF has the least efficient shields with their high costs and low SHP to compensate.
Cybrans, may have high mass costs, but their SHP is higher than that of a UEF shield.
~ Stryker