Anyone here had a go at beating Keto on hard? I managed to beat her yesterday after 2 days of trying multiple tactics. The problem I was having was that in the 2 hours 30 mins you get before she arrives I wasn't sure what was the best way to build up, I tried things like massing choppers and trying to tech to tier 4 and spam missiles but in the end I downed her really easily using probably the most obvious and simple tactic.
I just built Vipers until I was 1 point under my vehicle limit of around 40, then used the 3rd rank Auxiliary Fleet request from Thorne to bump my fleet up as high as possible. Once Keto arrived I split my fleet into two groups and hunted down all of her fleet, being very careful not to lose any of my own ships. After that I surrounded her flagship to prevent any spawns going loose, built some repair cranes on the nearest island to top up any damaged vessels then attacked with everything I had, the Colossus from Throne made a big difference.
If I'd spent more time trying to increase my population I could have probably gotten a much bigger fleet using the other Auxiliary Fleet calls as well.
If anyone else has a go at this I'd like to hear how, it's not that difficult in the end, but I bet some people who can build up faster than me could do some fancy stuff with Firebirds and the like.