Super high combined chlorine

[themaccs]

Help!! Started having problems the end of last season with chlorine disappearing - at that time I had a CYA over 100. I don't remember having problems with high CC levels - just chlorine disappearing like crazy. Fast Forward to trying to get things going this season. My CYA dropped to between 30 and 40 and I can't seem to get rid of my really high combined chlorine levels. Earlier this week I had pretty good readings at the pool store (didn't have refills on some of my home testing agents yet) - FC - 2.5, CC - 0, pH 7.4, TA - 180, CH - 210, CYA - 40. Pool is 19,500 gallons. I made the mistake of not testing for a couple of days and yesterday when I tested CC was out the roof again. I added about 10 gallons of bleach (6%) last night. This morning readings are as follows:
19,500 gal vinyl liner pool with cartridge filter
FC - 0.2
CC - 5.5
pH - 7.2
TA - 160
CH - 210
CYA - <30 (but looks like it is pretty close to 30, certainly above 20)

Water looks almost perfect - a little foam when I first open the electric cover in the morning that goes away as soon as the cover is open, but otherwise pretty much clear.

My plan for the day - add 17 gallons?? (do I really need this much? - I am really concerned about damaging liner) bleach this morning and brush, check again at noon and add chlorine as needed, check again this evening and add chlorine as needed - and keep doing that all weekend. I may use a little stabilized chlorine to get my CYA up just a bit. Am I on the right track? How do I handle my pH with my TA high?

Thanks for any help you can offer me!