I don't consider that a hijack, PJ.
I like to pour at medium-thick trace myself (never had good success pouring too thin), and I can swirl just fine. If I want my swirl color to reach deep into my soap and not just float on top, there are 2 different ways I can achieve that:
1) I pour about 1/4 to 1/3 of my main base color into the mold, then I haphazardly drizzle some of my swirling color over top, then I pour more of my base color in, and so on.....alternating like that all the way up to the top. Then I take a chopstick and swirl around, making sure to also make a few upward lifting motions with the chopstick. My mold is such that my soap comes right up to the top edge so that I can level my soap batter off with a single swipe of my handy-dandy cake spatula. If it's not as exactly perfect as flat as I would like, I just leave it be and plane a thin layer off the top of the bars after I unmold/cut.
2) Or I do an ITP ("in the pot") swirl. Just right before my batter is at full med-thick trace, I grab my swirl colors, stand on a stool, and start to pour them in a squiggly stream from a tall height (so that they reach deep into the batter), then I gradually lower my arm so that they also get distributed nearer to the surface. Next, I give the batter one gentle, half-hearted stir with my spatula before pouring into the mold. As I pour, the colors get swirled on their own just by the pouring motion, but I sometimes also finish things off with a chopstick if I feel the soap needs it.
IrishLass