Problems with Printing in PETG

[TigerMike]

I have a TAZ6. It is my first printer and bought it 2 years ago which means I have 2 years experience in 3D printing.
PETG does tend to string somewhat. I’ve printed at 240°c and also have printed at 235°c with good luck. FWIW, here’s my first post on this forum where interestingly enough I reached out to the community with my PETG first layer issue.
-Mike

TAZ6 - PETG first layer issue

Not sure if this is a Z-offset issue or a bed level issue, or a bed flatness issue. I’m attempting to print a large spiral and the first layer appears quite good except in two areas. The upper right portion of the bed has a slight issue and the lower left is terrible where the filament is either not adhering properly or something else. The bed was cleaned with iso-alcohol and a thin coat of glue stick applied. Nozzle temp is 235c and bed temp is 80c. First pic is upper right, 2nd pic lower left…