Invisalign Express - 29 Years Old, Minor Crowding Issues on Top and Bottom. - Pittsburgh, PA

So, can anyone explain this overcorrection to me? I finished all of my Express aligners... My teeth aren't really exactly where I'd like them to do which is disappointing because they told me that the Express would work for me. I don't know if it's worth it to pay for the full set, because I would say only a few extra trays are needed. But anyway, ortho gave me my overcorrectors... Are these like a continuation of what I was doing? or are they making things "worse" like some others have said? I figured since my teeth weren't perfect before these, then maybe mine will continue to help align? All I know is, they hurt like h*ll! They hurt more than when I first started wearing the Invisalign almost. Ouch.

I'm on my refinement trays now... That means I only have about 6 trays to go. The internet on my phone isn't working right now, so I can't send pics to the computer (will update later). Overall, I'm very happy with Invisalign Express and am very happy with the price for the value. My ortho did not charge me for refinements, so my overall cost is at $1200.
My only complaint... Holy cow, my teeth are yellow! I have been so disgusted with my stained teeth lately, and I'm pregnant so I'm not supposed to do any whitening. But, I was thinking about it, and most of my teeth are covered in the cement used for the buttons. Maybe my ortho just is pretty careless, or it's normal to have your teeth covered in it. I do have quite a few buttons in the front. I guess at this point I'm assuming the cement is stained? I was looking through pictures at the beginning and my teeth are not nearly as yellow. Has anyone else had this issue? I can't wait to get this stuff off for that reason!