1- each 10 ppm of chlorine from pucks gives I think 6 ppm CYA, or stabilizer; it can add up really fast, trying to maintain FC high and such- I would save the pucks and only use when leaving for several days, like vacation, and use bleach for daily maintainance
2- 1 gal, 6% bleach will add 2 ppm FC to your pool approximately. At your CYA level, you need to keep it I think 8-12 range; if you hit 12, it'll probably go down 2-3 points each day to sunlight (how much you lose increases as your level increases. at CYA 100, I think you lose 20% in full sund; but every pool is different, this is just a guess on my part!)
So 1 gal bleach a day, maybe... (I use 1.5 gal every 3-4 days with CYA 30)
3- At FC 8, you should be able to get pretty good pH readings- its above 10 that the FC really screws with the pH readings. So you monitor pH as your chlorine goes down, add acid/borax to adjust, and add your chlorine; Don't let your FC below 8, though; it's an invitation for algae blooms at your CYA...