Is there anything I can do to improve this?
Yes, take this part out:

"read Stephen LaBerge's book on Lucid Dreaming for 10 minutes to get a LD mindset. "

Turning on lights will only make your brain think it's time to wake up. Combine that with the fact that after 4:30 hours (a bit less actually, because I'm guessing you didn't take into account the 15 minutes a person usually takes to fall asleep), you're still experience a good amount of N-REM sleep, and you're just delaying your circadian rhythm which will make your REM episode come later, making the WILD harder. If you can, audio book version works just as well without the issues of requiring light, or just do some visualization.

Also, mediate your WBTB duration relative to your drowsiness/dream recall, not on a fixed amount of time. Knowing your "sweet spot" (which varies every night) is the key for easy WILD induction. Good luck