I am currently using "NOW" brand "Panax Ginseng" at 520 mg each. I will make a couple of suggestions that may not apply to you (since you've been experimenting already) but that others should know:
1) There is some disagreement between sources about ginseng and hypertension. Some say it is a problem while other say that titrating up slowly solves it. So, don't be a hero. Start low.
2) Get a cuff and keep an eye on it, especially during the introductory phase.
3) If you are unsure about any particular meds that you take, talk to your GP about possible problems with it. Hypertension is a serious matter.
Born in 1953, 1st symptoms and misdiagnosed as essential tremor in 1992. Dx with PD in 2000.
Currently (2011) taking 200/50 Sinemet CR 8 times a day + 10/100 Sinemet 3 times a day. Functional 90% of waking day but fragile. Failure at exercise but still trying. Constantly experimenting. Beta blocker and ACE inhibitor at present. Currently (01/2013) taking ldopa/carbadopa 200/50 CR six times a day + 10/100 form 3 times daily. Functional 90% of day. Update 04/2013: L/C 200/50 8x; Beta Blocker; ACE Inhib; Ginger; Turmeric; Creatine; Magnesium; Potassium. Doing well.