CSI being a little low for a short while is not a problem. And really it isn't a problem until it is -0.6. I would lower it to 7.2 and see how long it takes to rise back to 7.8 just so you'll know. Then we can make a plan for vaca.
ok pool dv here is my 630 results:
fc: 2.5
ph: 7.6
ta: 60
csi: -.25
i only added chlorine. I'll test ph before I go to bed around 10 ish to see. I don't think it will make it till tomorrow morning at 630 am and not be higher than 7.8. But we will see. So for a 12 hour period it went from 7.2 to 7.6 so far.