Your CYA should be at or near 30 to SLAM.
You cannot test a CYA of 22. The scale of the vial is logarithmic. So when you do the test, fill to a line (say 80), glance for the dot, if you see it, fill to the 70 line, repeat until you no longer see it.
You should raise your FC to SLAM level based on the expected CYA level at the time you are dissolving the CYA powder. No reason to delay.
Take care.