First, is it possible that what your HAVE BEEN doing (regarding your W as wells as your kids) is not working?
If you think it is working (just refer to the results and if there are any negative aspects to things) then keep doing what you are doing.
If you feel things ARE NOT working, then it is time to change what you are doing. How ever that may look.
Like you, my kids are with my W during the week. I am concerned right now about my D14. I do not have any evidence and do not currently expect her to be skipping or things like that. But I do not doubt that as she gets older, there may be a desire to skip classes and hang at the empty house (when W is at work) with her friends. She has already had one (knbown) incident with pot and has likely dabbled in alcohol, as well. My W has also left D14 to her own designs for the most part, in the evenings... and on weekends when my W is out with her own friends.
Anyhow, the point is... what would I do if my W were unwilling to discipline or restrict. And I would have to say that, regardless of whether my D14 hated me for it or not, I would seek legal counsel and perhaps have mandatory supervision required for her in those situations.
So again, to paraphrase 25's motto in her sig...
"Would you rather be your kid's friend... or their parent...?"
This is about the current future and well being of your child(ren), regardless of whether they feel you are somehow ruining their lives.
