For example, in 7k, do you use 4 keys for one hand and 3 for another in a single row? (Like ASDF JKL) or do you use the Space Bar for the middle key (Like SDF Space JKL)? I've been playing 5k and 7k instead of focusing on 4k for 2 weeks already, but it feels really awkward with both styles and I can't seem to get used to it.