Can a lower blepharoplasty help with hollow under eyes and dark circles? Make it worse? No bags or puffiness here!

The answer depends on your specific anatomy and it depends on how the lower blepharoplasty is done.  Ideally, if there enough fat present, it is best to reposition the bags/fat to fill the hollow area (dark circles). That not only insures the bags are gone, it also fills the hollow area and insures you won't get hollow later. If there is not enough bags/fat present, then it might be best to do filler injection instead. See link below.

If fillers were helpful in diminishing your under-eye shadows, it's possible that fat grafting could do the same. Fat grafting can be less predictable than fillers but it also has the potential to be longer-lasting.  Blepharoplasty may also be an option if you have enough fat to redrape into the hollows.  You should consult with a surgeon that has substantial experience with cosmetic eyelid surgery and fat grafting/repositioning under the eyes.  

You really need to post some pictures to get a good answer.  However, if you have hollow lids and prominent orbital rim,  a regular bleph is not going to help much.  By removing some skin, you do stretch out what is there, and this can sometimes make it appear lighter.  Fat transfers can be done, but in this area they are tricky, so see someone who does them routinely.  Your other option is to continue with the fillers.   Something like Restylane usually lasts at least a year.