May you never be low on beer for drinking RB.
I'm with the Chief on tomato sauces not being cooked for extended periods.
Yet to get the sauce to the desired consistency cooking the maters takes time since maters contain a lot of water so time is your friend here.
Adding your herbs and spices later in the cooking process is the way to keep them "up front" in the final outcome.
I haven't given up on the crock pot yet.
I did the hack of using a dimmer switch to control temperature and it worked. Now I need to figure out how to use it.