They happen to all of us, I'll wager. Regardless of the amount of experience, prep, and care we take, from time to time, we all catch a little weeper or two. For me, they're almost always either on the Adam's Apple or along the corners of my mouth. What spots are most likely to produce weepers for you?
Adam's apple. I pull that area to the side, but still manage to catch it with some frequency. Too much of a hurry I guess.
When I first got back into wet-shaving, I had a real propensity of getting little weepers on and around my laryngeal prominence! ( or 'Adam's Apple'— I just like using 'laryngeal prominence' as it sounds rather risqué ) Once I learned a couple of techniques to work around 'it' (skin stretching and/or swallow & hold during the shave pass), these weepers went away.
Very rarely under my chin on either side at the top of my neck. This is the only place my skin doesn't agree well with an against the grain pass. So, I just alter the angle of the pass slightly so its not directly against the grain here and that usually does the trick!
I use to hit a part of my left nostril a lot. Either my techniques are better or I shaved down that skin, I haven't done it in 6 months now.
I get a weeper under my jaw area every once in a while if I use a blade too long without changing it.
Came here to say exactly what you said, but you had already said it.. Mostly on the right side, as that's the only part of my face where the grain isn't down, but front to back. As you said, I just don't do a true against the grain sweep back there.
I don't get them as often as I used to, but when I do, they tend to be on my neck to the rear. It's always seemed like an unlikely place to get them, but that's where it happens. When I first started, I always used to hit a small mole that's on my chin...which is nice because it would bleed forever.