Do you mean additional studying on the WK items or other parts of Japanese?
You can form a study routine by doing (some) reviews on WK first and then do other stuff, e. g. practice handwriting, reading stuff, study grammar… You can also do both ~ WK and non WK studies ~ separately. No need to follow WK SRS intervals with anything else than your reviews here on WK.
As for your concerns the following thread might be interesting for you:
Whats your question in particular? Everyone has different ways how to study and what works for them. If it helps you to write things down there is no reason not to do it. Some other durtles also created sheets for printing, in case you are interested:
If you want to learn about how others study feel free to check out “study logs”. We also have the following master list although not everyone enters their study log in there.
In general, one week per level is very fast. Reading your comment gives me the impression the mnemonics don’t work for you. In that case you can create your own. Something that makes the items more tangible for you.
Do you already know one of the kana systems? Otherwise I’d recommend to learn hiragana first before jumping too deep into kanji.