Hi Matty-j.
thanks for sharing. Never worked with Radiatas. But If they respond in a similar way with 2 needles pines, I have a suggestion.
Get your scissors out and trim all your lower needles to about 2-4mm above the sheaf. Leave some needles untouched around the top of the branch. I tend to leave about 8, which surrounds the end of the branch. Don't do it to the weaker branches at this stage. Beginning of autumn late autumn I think is the ideal time to do this.
It helps create back-budding. And by the length of your pines, I think your going to need that back-budding.
Your first 2 pines after wiring) are very confusing in the photo. The bottom 2 much better looking to me. I use a lot of raffia when wiring my pines. They grow in spurts all year, and its very easy to get left with wire marks on your branches if your not watching them carefully. Again,

.
Noticed mountainman and shibuis, total bonsai experience, 60 plus years + combined...holy smokes!! Hope they agree with my advice. If not, I'd love to hear/read what they would suggest for your on-going care.
Good luck with your new stock., gotta go. Moto GP in Spain just kicking off. Yesterday qualies were a ripper!!
woody