The only thing the numerical result of the blood test tells you is if it's positive or negative. A higher result means it's less likely to be a false positive. They generally cut off at 5.00 and just say it's above that, because the way the test works, it's not a linear range. A result of 10.00 does not mean you have twice as many antibodies as someone with 5.00. The numbers relate to how much light was absorbed by the test sample when it was measured in the spectrophotometer.I've used lysine in the past, and it seemed to reduce the frequency of outbreaks when I took 500-1000mg/day. I've tried it for treating genital outbreaks, and for cold sores before that, and it never seemed to make the outbreak shorter or less severe. The few studies that support the use of lysine tend to show better effect for preventing than treating, but none of the evidence is very strong.
I've tried Echinacea for outbreaks, and it did nothing. Works great for stopping a cold or flu in its tracks, if I start it as soon as I notice symptoms.
Topical use of propolis has been shown to speed healing. I've never tried it.
http://www.ncbi.nlm.nih.gov/pubmed/10782483?ordinalpos=4&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
Apparently, it's the flavonoids in the propolis that are active.
http://www.ncbi.nlm.nih.gov/pubmed/1338212?ordinalpos=7&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
Here's a clinical trial of ascorbic acid and bioflavonoids for oral herpes:
http://www.ncbi.nlm.nih.gov/pubmed/339141?ordinalpos=89&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
Do some surfing at pubmed, and you'll find a lot of stuff like that.
I don't think I'd use large amounts of licorice alone for a long time. It can mess with your potassium levels and raise blood pressure. It's used in a lot of traditional Chinese herbal medicines, and like most herbs in TCM, it's never used alone.
There are few or no studies that look at how viral shedding is affected by herbs or vitamins. The one exception I can think of is a study of vitamin A deficiency in hiv-positive women. (lower vit. A levels were associated with increased shedding.) So to answer your question, no, I don't think you need to take immune boosters unless there's some reason your immune system needs boosting. Sounds like it's already doing its job with hsv, since you don't get any symptoms.