Hey brother,

Good advice here already given, so can only comment on what respected sages have already advised.

Short end of the stick is that you will never get your guitar tuned, no matter what software or hardware you use. Can't be done.

Problem is as already advised is that tuning wanders, made worse by lighter gage strings. When you first hit a note, the attack twang raises the string stress artificially making it like your guitar is tuned too sharp. Tune to this and your string is already fake news tuned flat. Note dies down and the tuning is different. There is no cure for this artifact but maybe part of the beauty of it all.

May be a blessing that your tuner flickers. Means it is sensitive enough to detect the wandering.

There are tuners software that are buffered to give a better estimation of where you need to be.

This is what I would advise as just another path dealing with the problem. You have already gotten good advice.

Reaper, a killer DAW. Not jump to Reaper from this venerable program, but download and install the free vst package they offer. This is the access:

https://www.reaper.fm/reaplugs/

Mind blowing in the extent of the offering. Fully compatible with PowerTracks. The package includes state of the art noise reduction, compressors, ReaControlMidi a revolution in midi tuning without artifacts. List goes on.

What you are looking at is ReaTune. Only thing I use, and it does flicker. For info only, Reatune is a full pro tone correction unit if you need it to do this. Like Melodyne only free.

Best,
John