Dman, Morning... I like digging through the painting threads , ever on the lookout for tips and new things to try... If I may add just a bit more... I may have missed it, but what type of AB are you using? My technique to mottle... I almost always use Acrylics, and mostly Tamiya or Model Master. Depending on what you are wanting to do, I use straight Lacquer thinner for most reducing needs. For very fine mottling or "squiggles" I thin just a bit more then usual, remove the air cap from the tip of the nozzle (Becareful not to hit needle, it is now exposed) add about 5psi, get up close, about a quarter inch or so, and move with a purpose. lol, in other words know what you want to do before begining!lol... The advise on remisting the base coat is (if needed) is what softens and blends in the mottle, and you did a good job on it. It look very "soft" now and thats the end goal. This was jus a bit more info and another technique. Keep up the good work!
Take care... Doug