You can do this, em79! Everyone here struggled through (and still do) with seizing, accelerating, morphing and all manner of issues. You've only done 3 CP batches so don't throw in the towel.:-D
Doing a test batch is always a good way to go when using a new FO for the 1st time. I'd say your problem was the temps of the lye and oils. Try going down to about 100* since you're using palm oil. It's melting point is 95* so I like to stay above that to avoid steric spots. Once you're to emulsification, stir in your FO with a whisk or spatula. If I know I'm using an accelerating FO and want to add design, I usually use it to my advantage. I bring the batter to emulsification then divide and color the portions. I then add a portion of the FO to the first color, mix and pour. Add a portion to the next color, mix and pour. Continue on until you're done. You can create some nice layers this way that won't break through to the one below because the batter is already very thick.
I don't plan a complicated swirl unless I'm using an FO and recipe that I've used before and know it won't cause me problems. You'll find your groove, em79 but it takes time!