The last three times I went to Cedar Point, I went in mid-June. Just shoot for whatever is available first from Sun-Friday and go from there. I don't think you're going to get nightmare scenario (pun intended) Halloween event FL situation where you will wait over an hour. Will you maybe wait 30+ minutes for some rides? Yeah. It's Cedar Point.
But, with 3 days of FL, you can take your time and get everything in.
The alternative is to go earlier in June when the park isn't open as late, and just make the most of it. I'd personally rather ride less and have 10-10 to come and go from Breakers as I pleased, and not get to ride as much. The combination of Breakers, Cedar Point, and FL is a well rounded experience regardless. If less rides and 'a little' more wait during the day means I get to view the park lit up, so be it. I always take my chances on that.
My other advice is when (not if) you see Maverick's FL spilling out into the midway, just pass by and check it again later when you're in the area. That FL queue is either feast or famine.
Good luck with your health problems. I hope they don't get in the way to the point where you can have an awesome time.
I'm not a fan of long narcissistic TR's anymore, but I'd definitely like to see yours when it's all over.