I think they could use some slight adjustments but I like what you're trying to go for, adds more variety. But elves need to be nerfed, their way too strong in that layout, spy AND income?? like bruh... If you want people to pick different races and have variety don't make 1 insanely over powered. If you reduced the spy bonus that would balance that race a bit. Elves have been over powered for a few ages now be careful there.
adding things like % more casualties when you're attacked might be a good way to punish those who wish to go unhittable using those races, but should only be added if you have fixed new accounts being able to raid people. someone with 100-300b da shouldnt be able to be raided by someone who makes an account slays 1-2 days worth of turns and boom inrange of raiding, its even worse in its current state since theres NO protection from this at all right now. if you insist on the casualty "bonus" you should be implementing the old cap where people could not raid someone with more than x50 your SA (used to be x100 but with turn trading new accounts can get a few bil SA in a couple days once we're a few weeks into the era, x50 is good middle ground imo)
you also have no good sentry race currently but elves sitting at a massive 40% spy bonus....hell hobbits is even negative for some weird reason.if you wanted that to be a "banker" option that negative bonus needs to go MINIMAL. not having something to negate elves 40% spy bonus is horribly balanced, if you disliked crying about "rogues" this era, it will be tenfold next age when no one has a viable sentry option to race change to. Will force many mid/small accounts to rage quit when people start getting bored n chaining koc for giggles.
over all I actually really like the changes - or at least what it seems like you're aiming for, but if this isn't adjusted slightly in some form it will make for a shitty age for like 95% of KoC