Every technique just is
. Sure you can evaluate on different aspects and find room for improvement. But nothing you do can ever change the technique you just did. When you think "Oh I know this technique" it is only the first sign that you are in trouble. This only kills your Aikido. Beginner's mind...you know nothing
What do you think is 'spiritual power'? You have explained why you think somethings are not:
I have seen explanations based on many different things discussed but all boil down to superior something that in turn therefore can dominate by choice the less superior. Whether it be through better skills, better education, better .....well whatever.
Spiritual power is (e.g.) the ability to enjoy yourself, be determined, be aware, reflective and compassionate.
Working on this type of character traits requires change of self...
Another spiritual approach my teacher always tells:
Before executing a technique open your self to the cosmic KI, let it flow in, blend it with the KI of you partner. When the technique fails, you clearly have not opened yourself to KI enough.
and then he smiles sarcasticly...