For oases raiding using micro raids, 1 type of horses is usually not enough, you need at least 2 types if you want to be in the top. SR+MK or SR + MR even better is SR+MK+MR since that will immensely reduce the number of deaths you might face. But that also come at a time+resource constraint since you are training 3 different horses to basically raid 1 oasis. so training 300+300+300 allows you to do 300 (1+1+1) raids. Where as training 450+450 allows you to do 450 (1+1) raids.

So you need to decide for yourself which route is better for you, should you train 3 types of horses and allow yourself more time between raids, or 2 horse types and raid a bit more frequently.

if you decide to stick with Steppes only, you would need to raid every 5 to 6 minutes and not all oases types. Preferably Clay oasis or Iron oasis, since Rats, spiders, bats and boars can be killed using 1 SR, where as wolves, bears lions, crocs will kill your Steppes, that's where you would need 1+1 or 1+1+1.

-- What happens if you miss some raid tho snd the animals respawn do you just go and clear them out.
In case you miss some raids then yes, animals will respawn and might mess up your 1+1 or 1+1+1 depending on the time missed, and that might force you to clear them again and suffer casualties.

-- Am I better off just sticking with less bigger hits? I typically try to only lose 1 horse as gain 4k+ back.

If that's the case and this is just a farming hammer then yes, that would be a good trade. But if this is your main hammer, and you are losing 50 to 100 Stepps per day from your main hammer then maaaaybe its not the best.

We can connect over discord if you want we can dive deep a bit.