Pixel soldier triggers don't support rear curtain, hss, etc. Your trigger needs to support it, and so does your flash.
You'd need Pixel Kings, YongNuo 622c, or similar triggers that have that capability. If you're on a budget, I suggest the YN622c trigger set. It's cheaper and you get more bang for your buck than the kings, and with the right flash, supports menu setting flash changes.
Keep your pixel soldiers though, in case you want to remote trigger your camera/flash chain (i.e. Your pixel soldier plugs into only the shutter release port, tells the camera to fire remotely, which fires the YN622 or pixel king or whatever trigger in the hotshoe, which sets off your flash(es).