Re: Repetitions scheme
It's all about the practice. Sensei often recommended reps of 100 for solo exercises, and he would leave us training for a long time but several times on tests: "One chance, your best technique."
Doing tanto, jo, or tachidori I often just have the person who takes the weapon attacks next (1:1). I want to practice the technique, not the ettiquette.
How many reps at a time really doesn't matter quite as much as the result. Not the destination but the journey I guess - I try to get better each time as opposed to forcing 1000 sword cuts a day but sucking at most of the individual cuts.