As to the VLS RDA, IMHO, as long as he positions his horizontal coils so the bottom third of each coil is getting hit with air, he should be able to get good flavor. If not, then I would say it is not a very good RDA.
Either that or something is whacked with the juice..... From what I have looked at this morning, that particular RDA is liked by lots of folks. Since I have not tried that RDA then I can't be certain about the flavor profile (only what others say about it)......
My take away from his situation is that his coils are overly saturated for starters and if he is not running enough power then that will make the situation even worse......
If I were him, I would do the horizontal coil configuration and align the coils as close to the airflow ports as possible. I would also make sure I am running enough power for the claptons he is using. I would also make sure I didn't over saturate the coils. Hopefully he will read all of these posts and get it figured out.