We went April 16-23 (Mon-Mon) this past year. I also remember the JB fares showing up on Kayak first. We booked our tickets the day the fares came out on Kayak and paid $327 pp RT. To fly Sat-Sat or Sun-Sun was $617 pp RT!

I checked JB's website every day for months after we booked and the flights we booked never went below what we paid, so I got the best price that I could for those flights.
I have been watching Kayak and JB's websites every day, ready to pounce. Although I'd love to see something in the $200's, I'm not counting on it.