So I cleared out spectacle island and setup an immense defensive system for it but so far have not been attacked. My defense far outweighs my food and water but I really want to be attacked relentlessly and am wondering have I chosen the wrong settlement for this? Which one gets attacked the most? I have switched it to survival difficulty fast travel/wait and no luck. Any tips?

My Starlight Drive-in gets attacked a lot.

Unfortunately it seems that all settlements get attacked at the same time. I wasn't attacked till lvl 30 and had to let my security be in the red so to speak before I could a get a proper attack. Read my forum on "Settlements" in general discussions for more.

I want to see swath upon swath of Super Mutants and Death Claws get mowed down in my kill zones bristling with laser and missile turrets. And it's not like I can even get a dog to chase me into it or anything because its an island. We should have a defensive test protocol where you can spawn non lootable enemies to test your defensive prowess. I want to see those beaches roiling in blood and dead mutilated enemies!

PC version and console commands for spawning hostile enemies.

The system is weighted the more deference you have the less that settlement will be attacked

What Slaydo said. I'm level 58 and had never seen an attack other than a 3 feral ghouls attack. That was all and I had 13 settlements. So the next settlement I really didn't bother with defense-wise other than to put a cheap turret down. That settlement is now being attacked almost non-stop from super mutants.

Without console commands, don't expect a huge force to crash against your 100+ defended settlements. You'll have to create your own enemy army. Bummer.

Just put out enough water purifiers so that you have more water + food than defence.

Yeah I'm a console peasant so I don't have the option of spawning enemies:(

Oooo... good thought. Will do that when I get home from work.