I usually don’t respond to the forum notifications I get in my email because I believe it’s Lulzbot\s way of not helping customers directly. However…
I have had a TAZ5 for 5 years and I am still learning how to use it. Make Magazine rated the TAZ line of printers as among the best desktop printers.
What you describe may be the same problem that most people have with TAZ printers and that is one of practice and experimentation. TAZ printers are extremely versatile. On the other hand if you have anything but an E3D V6 hot end on your print head that is one problem. The “Hexagon” hot end does not heat very evenly in my experience. The next problem(s) are those of level and layer height. I don’t know if you have auto leveling but if you do you are ahead of the game. Setting your layer heights correctly may be at issue.
I have taken to making the acquaintance of the owners of Protopasta and if you are using a 0.5 mm or greater nozzle you won’t get good results. The TAZ printers and 2.85mm filament don’t play nice with each other. To use the words of ProtoPasta support the combination is “finicky.” For fine layer lines you will have to go with a fine nozzle. However getting a balance between temperature and print speed with the 2.85 filament is tricky.
I am waiting at the moment for Alex, the co-owner of Proto Pasta to get back with me as he is working with me to correct the print profiles for PLA. My big deal is that I am working with metal filament and that is part of my problem.
I have had some nice prints with my TAZ 5 (which has a bigger print volume than TAZ6) but I am struggling with metal filament.
You did not say what slicer you are using as it does make a difference. Layer width 120% seem to be generally recommended so if you have a nozzle width of .5 you will have a layer width of .65 The finer your layer height the finer and smoother your lines. Nozzle widths of .4 or less with the idea of no layer height greater than 80% of nozzle width is a good rule.
Knowing that Facebook has a 3D print group may help you as well.