Increasing the static amount of defence a planet structure will give will work great!

For about another year, then they will be too weak to do anything again.

Need a rework of how planet defences work in general i think, not just to make the numbers bigger.

I would suggest something like each defence structure also lowers the maximum possible success sligtly.

THat means that normally 90% is the best you can get. Well, lets say that if you have 5 obviation barriers, the best possible success chance you can get is 75% (even if your attack is more than 3x the total defence)
With 10 obviation barriers, the maximum chance of success is 60%.

Obviously the percent numbers i chose there were completly random, and would have to be playtested/experimented with - that example is each obviation barrier lowered maximum success by 3%.

I also think that anything that raises invasion % chance should help counter this, but opinions vary, im sure.

I should probably point out that this hurts more more than it helps me - i can take a planet with 10 obviation barriers without blinking.

+1, however not defense mods due to the fact people have used their limited artifacts on the trans entropy already.

how about extend the shields tree and make the new planet defense structure 1500 and have integrity to it, so instead of one sab to one said structure, it would take 2 to take out said structure?

sabs really arent a huuge deal, and that would make them near useless. also 1500 isnt near enough of an increase