I'm currently using the destructible shield generator from Forcemasters christophesis assets however it didn't come with its "weapon" so I instead modified a droideka shield. However when I increased the radius it didn't move the actual sphere, just stretched the distance at which shots were blocked. Is there a way to stretch the default droideka shield or do I need a new msh?

Open the .fx file with Notepad. The lines there ought to be self-explanatory.