Recently I transitioned from a 25 to a 10 (since we're down to pretty much one raid night main clears) as an alt raid and I have some words of wisdom.
Don't be demoralized. Its not so much that things are really more difficult mechanic wise, its simply that you need to pay more attention to them.
Prime example is sha of pride. on 25 the rifts are usually a mess. On 10 we hit a small wall, until it was brought up and grinded into people to always be looking to grab a rift when they can. While this was harped on 25 man, its easy to miss if a few people scumbag, and they'll slowly pileup. On 10 if 2 people scumbag it can be excrutiatingly messy. Malkorok is kinda the same, your ranged will be swimming in orbs, and I was often moving everytime a wave of orbs went out.
Its not that theres less mechanics, or that the mechanics themselves are harder, its that the ones that focus in on people will do so with much higher frequency. 25 man has some tighter timers, but 10 man has tighter mechanic focus (this isn't to say 25s can ignore them, but that normally half the raid is dragging the other half).
We were facing the same woe as you are, albeit with alts. After killing a fight we've generally one shot it, its mostly about getting your players to be more intimate with mechanics.