Your pramipexole taper with the use of 100 mg of tramadol sounds about right. The catch is that you will probably need to stay on the tramadol to manage your RLS, sort of like switching it for the pramipexole. If not tramadol, then you may need a different opioid.
Has your doctor done blood tests to check your iron and ferritin levels? Some people have low ferritin levels and their RLS is much better if they go through iron therapy. This can involve taking an iron supplement (which is slow to work) or an iron IV-treatment.
You asked about augmenting on tramadol, the answer is that it can happen, but is no where near as common as augmentation is with the dopamine agonists. Tramadol is the only non-dopamine med that has been observed to cause augmentation.
There are several things about tramadol that your doctor probably didn't tell you and may not know him/herself. The first is that there is an extended release version that you can take once/day rather than worrying about timing to take it in the evening. More important in the future is that tramadol is sort of a combination med. It is usually used as a weak opioid, which is fine for RLS. It is also a pretty strong anti-depressant, although it isn't FDA approved for this use. On several occasions, the FDA has refused to approve meds that are effective anti-depressants and also are opioids. The anti-depressant properties are important when it comes time to get off of tramadol. You need to taper it much more slowly than you would an opioid. Failure to do so can lead to a condition that is sometimes called SNRI Withdrawal Syndrome, which causes PTSD-like symptoms.
As for visiting a sleep center, you may or may not benefit from a visit. IF the center has a doctor who is very familiar with treating RLS, then it would be beneficial. If not, then it would be a waste of money. Your best bet at this point would probably be to call and ask to speak with a nurse. Ask the nurse if the doctor has experience treating RLS and patients who have been through augmentation. The answer (or lack thereof) should be rather telling.
There are two other options available to you. If you are close enough to one of the RLS Foundation's Quality Care Centers, then that is your best option. They are all RLS specialists and provide the latest treatments for RLS. Some of us travel great distances to see doctors at these centers. However, if that isn't a realistic option for you and your doctor would be willing to learn, then you might share this paper from the July Mayo Clinic Proceedings. This is the latest treatment protocol for RLS and was prepared by the leading experts in the US and Europe.
https://www.mayoclinicproceedings.org/a ... 0/fulltext