@sebastian-roth I finally got around to trying this out the other day and after running a check disk and recapturing the image it is now resizing the partitions correctly upon deployment. I didn’t have to modify the ‘d1.fixed_size_partitions’ again so I’m assuming that the capture process either worked correctly after running check disk, or else it just continued to use my modified version of that file.
Thanks for your help in resolving this issue everyone, much appreciated!