I don't think "consistently" means mapping specific sound to a specific pattern
and only that one specific pattern. It's more like if you choose as set of patterns to represent a specific sound, each of the patterns should be used equally as often.
For example, if you do pattern A in one section, pattern B in another section, and so on, then that would not be considered consistent. There will need to be justification for using specific patterns in specific parts. However, if you use patterns A, B, ... interchangeably throughout, then it can be consistent.
Obviously that's an oversimplification because whether the patterns are interchangeable also depends on the difficulty of the pattern, type of pattern, and feel of the pattern. I'd also be careful using too many different kinds of patterns for one sound or it may not make sense.
That said,
zozhko wrote:
If there's another sound (long note in particular) starting at the same time as the kick sound, does Ln count towards double, which emphasises this kick? Or do you have to make it triple? And what about triples? If there's a sound, which i use a triple for, during a long note, should i keep it triple? Even if it leads to an unnecessary difficulty spike??
If the sound is not prominent, you don't need to map it every time it occurs, but at the same time you need to be careful to not break consistency if you mapped it in every other place. If the part is unique in that 2 sounds coincide, you may want to try something different but not too different.