3 lbs. of stabilizer should add about 15ppm more of CYA which would put you somewhere around 40 which would be a good level. It may drop the pH some. But, you're OK at 7.8. If it goes over 8, then you'll want to work to drop it. Your TA is fine. Your CH is a little low. Usually the recommendation is CH between 200-400 for a plaster pool. Maybe just use a little cal-hypo for awhile as your source of chlorine and then switch back to bleach when the CH is in range.

Go ahead and add some more bleach to get back to around 5ppm or so. You don't want to let it drop too low and risk an algae bloom.

A request from me. Please make a signature line with basic info in it so we won't have to keep scrolling back up to find details needed to be able to give good advice. Click on settings in the top right-hand corner. In your signature, please put the following: type of pool, volume, type of filter, size of pump, and also that you have a K-2006. By doing this, it will make it easier for us to help. Thanks.