Well, I've changed the O-XDD to have a move cost of 0.67 in the SW 8.8-OP specs. It makes no sense rhat an X-ship would have the same energy curve as an ancient F-CA. Lowering it to 0.67 gives it respectable power, though it's not overwhelming. Some non-X-ships have 34 or more power with a 2/3rds movement cost (H-BAR, L-CWLP, H-TAR, H-APA).
Do you think you might change the OP+ specs in a similar fashion?