Weathering can be tricky. I tend to end up over weathering at times.
Agreed, it's the primary reason I switched to oil paints for weathering (that, and I feel they just have a more organic feel/look to them). They are so easy to remove and work with over time. I can let models sit for days and then come back and still mess with them. The only real drawback for me is they take a week or more to dry so you have to let them sit for a time before the final flat coat but for me that is fine, I am not on a schedule