This morning's update

Skimmer socks cleaned
Filter pressure 21
Vacuumed the floor and walls
Pool open
Raining

Numbers
FC-25
TC-25
CC-0
Ph-7.4
TA-210
CH-140

Numbers seem to be climbing a little? Why?

Questions
1) Best way to stay ahead of Chlorine draw?
2) How best to clean crud from within the skimmer walls (they're black, sticky and oily).
3) How best to go about the various adjustments for my numbers:
a) Lower TA by about half
b) Lower CYA by about half
c) Lower Chlorine by a little over half
I've read the forum and understand the aeration/low ph process for TA, the drain and fill for CYA, seems to be keep the pool open for Cl. However, looking for a systematic process to work through all these without sending everything amuck....