Dear toyL and c/g,
I used to find Sinemet CR was one of the worst offenders for dyskinesia.
Ron makes a good point about your tremor symptoms sounding more like dyskinesia.
I might be wrong since I don't have a tremor but I didn't think head tremor was part of PD tremor but more of an Essential Tremor symptom so maybe check that.

Ron, I too 1/4 just about every dose I take except I find Madopar easier to quarter.
The new Sinemet is a bugger of a thing to quarter accurately even with a pill cutter I found otherwise I would have continued on it.
Do you have the same problem?