Welcome to the forum. Sorry you had trouble with mathematical symbols.
First, all HSV IgM antibody test results are to be ignored. No STD or herpes expert ever orders or recommends IgM testing, which is highly unreliable. Here is a thread that discusses HSV IgM testing in more detail. Even though 5 years old, the information remains accurate: http://www.medhelp.org/posts/STDs/Confusiion-over-other-IgM-Herpes-posts/show/248394
My second comment is that probably most people are quite comforted to know they are not alone when they turn out to have a mostly benign medical condition that affects more than half the population. In any case, since you haven't been having cold sores or recurrent genital blisters/sores, most likely you never will, and you're even less likely to have any sort of medically important complication.
To your main question: No conclusion can be drawn from the numerical result (technically, it is an optical density ratio) of an HSV-1 (or HSV-2) IgG test, especially in the strongly positive range. If you were to be tested 5 more times, the OD ratio might vary from 2.0 to 8.0; that could happen even if the same blood specimen were tested 5 times, using different batches of test reagents. In other words, your premise is wrong: the OD ratio value does not directly reflect the amount of antibody in the blood; it is more dependent on the chemistry of the test. Similarly, the numerical value says nothing about duration of infection, its severity, the frequency of outbreaks, or the effectiveness of the immune system. In a way, it is unfortunate that labs even report the numerical values of HSV test results. A verbal report of negative, positive, or (sometimes) equivocal would be a more accurate representation of the meaning of the test.
As for distribution of all results in HSV-1 positive persons (the shape of the "curve"), I don't really know; this has never come up before. But for the reasons above, I don't think it matters. I would guess it is skewed, i.e. not a symmetrical bell curve distribution. I imagine a peak ELISA ratio around 4, with a fairly smooth rise from 1.1 to ~4, then with a long tail that could go out to 7, 8, or even 10. However, results with high numbers are rarely reported; most labs create a cut-off, and report high results as "over 6.0", "over 7.0", etc.
Finally, you definitely do not need a confirmatory test. You have HSV-1, just like roughly half the US population (not 70-80%, although it reaches that proportion in people over 60 years old). You can now be on the lookout for symptoms of recurrent oral or, less likely, genital herpes -- but having not had any until now, most likely it won't happen.
I hope this helps. Thanks for an opportunity for a blog-like response which I will keep handy to aid in replying to similar questions in the future.
Regards-- HHH, MD