I just make my splash screen images distorted so when it stretches for 16:9 or 16:10, it looks correct.
I was seriously going to do that but then it will still be wrong for some devices. But I guess you'll have covered the majority 16:10 and 16:9.
But I just found something. If I install from the Play store, the splash screens are ok.. as in, maybe slightly distorted, so apparently using a different splash. Install locally and they are distorted. Maybe I'm just going insane. Never mind that my ads have stopped displaying now that I've uploaded to Google