Kmikaz3
, cinching is definitely the most frustrating part of getting the EC&DK to look right and, as you've noted, getting the base (standing end) located where you want along the strand complicates things.
Remember that the cord runs from the standing end through the center of the knot all the way to the top (to your initial overhand knot which forms the crown), then back and forth down through the knot, around the bottom, then back and forth up through, then out through center of the crown. As you initially pull cord up through from the standing end to locate the knot, there's a tendency for the top wraps to be loose and the bottom wraps to become too tight. As you cinch through, make sure not to over tighten the bottom as you start back up, then if you pull the working end too hard it's pulling the bottom too tight around the standing end.
If the bottom is too tight or too far off the bead, just reverse course pulling more slack toward the bottom to loosen a little there and move the base back toward the working end (bead). It's easy to mistakenly go the wrong way so just reverse course to correct. It's always harder to loosen a section than to tighten one up.