Topic: Put different Gamma only material on Each faction island
And associate different type of mods with these mats. This will at least create somewhat a resource choke point and people have to make certain choices regards to their fitting and resources available to them. Having colixium on all gamma island is almost the same as not having it.
In current stage, if both side have gamma, what's the point of seiging it it beside bragging power and driving the other side out? I highly doubt people would take the time to terraform again and most would quit. I don't think this is the desired intention.