No, 3 is the actual norm, and rarely is more. Look at the kanji page you will find half has only 3 vocab or less, counting all readings, and those with more usually have vocabs unlocked at later levels. Kanji who give more vocab than 3 at unlock are rare, if any. Yes, some kanji has a good number of vocab, but some I havenāt even unlocked yet at my current level when i looked at random kanji at lvl 21 (has some of the numerous kanji).
If you are fine with 3 vocab, with some different readings, then it works as intended. There are no half dozens at unlock that I know of 
No, I have my similar vocabs divided in weeks and months, after failing one but not the other at Guru/master level. Iām not talking hours, or even days.
But honestly, the most important part is to actually do the vocab, late or not. Some try to just do the kanji and think that is enough, just to fail every review later (the vocab does help strengthen the recollection)
I find delaying them even a week from Kanji guru is enough to weaken the recollection for me. The kanji gets strengthened by having the vocab drilled shortly after first guruing it. And then, once both kanji and vocab has moved on to higher areas, they are more likely to stay in long term memory after their exposures.



